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Citing data

More resources for citing data.

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Data should be cited within our work for the same reasons journal articles are cited: to give credit where credit is due (original author/producer) and to help other researchers find the material. If you use data without citation, that is deeply problematic for academic integrity as well as reproducibility purposes. Pay attention to licenses (here's a page on those) and give attribution!

A data citation includes the typical components of other citations:

Author or creator: the entity/entities responsible for creating the data Date of publication: the date the data was published or otherwise released to the public Title: the title of the dataset or a brief description of it if it's missing a title Publisher: entity responsible for hosting the data (like a repository or archive) URL or preferably, a DOI: a link that points to the data Data Accessed: since most data are published without versions, it's important to note the time that you accessed the data in case newer releases are made over time.

Citation standards for data sets differ by journal, publisher, and conference, but you have a few options generally (depending on the situation):

• Use the format of a style manual as determined by a publisher or conference, such as IEEE or ACM. If you use a citation manager (highly recommended for organizing research reading!) like Zotero (which we support at NYU - check out our Zotero guide ), you can have them export your citations in whatever format you need.
• Use the author or repository's preferred citation that they list on the page where you downloaded the data initially.

Here's an example of how to find the citation information for a dataset hosted on Zenodo , a generalist repository that houses data, code, and more:

All scholarly or academic work requires that you cite your sources, whether you are writing a long paper or a quick report. Why is citing your research so important?

Researching and writing a paper ideally involves a process of exploring and learning. By citing your sources, you are showing your reader how you came to your conclusions and acknowledging the other people's work that brought you to your conclusions. Citing sources:

• Documents your research and scholarship
• Acknowledges the work of others whose scholarship contributed to your work
• Helps your reader understand the context of your argument
• Provides information for your reader to use to locate additional information on your topic
• Establishes the credibility of your scholarship
• Provides you with an opportunity to demonstrate your own integrity and understanding of academic ethics

Partially adapted from "When and Why to Cite Sources." SUNY Albany. 2008. Retrieved 14 Jan 2009.

• Data-Planet Data Basics Data Basics is a module in Data-Planet that provides resources and examples for citing datasets and statistics when incorporating them into research.
• IASSIST Quick Guide to Data Citation Includes examples from APA, MLA, and Chicago styles.
• How to Cite Data A comprehensive guide with examples from Michigan State University Libraries.
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• Last Updated: Jun 18, 2024 3:35 PM
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How to Cite Statistics

Last Updated: May 1, 2024 References

This article was co-authored by Gerald Posner and by wikiHow staff writer, Jennifer Mueller, JD . Gerald Posner is an Author & Journalist based in Miami, Florida. With over 35 years of experience, he specializes in investigative journalism, nonfiction books, and editorials. He holds a law degree from UC College of the Law, San Francisco, and a BA in Political Science from the University of California-Berkeley. He’s the author of thirteen books, including several New York Times bestsellers, the winner of the Florida Book Award for General Nonfiction, and has been a finalist for the Pulitzer Prize in History. He was also shortlisted for the Best Business Book of 2020 by the Society for Advancing Business Editing and Writing. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been viewed 30,466 times.

When you're working on a research paper, citing datasets and statistics you used is just as important as citing articles and other references from your research. It allows your readers to independently examine the data and verify the methodology used in collecting it. The basic information in your citation is similar, but the format may differ depending on whether you're using the Modern Language Association (MLA), American Psychological Association (APA), or Chicago citation style. [1] X Research source

• Example: New York City Department of Health and Mental Hygiene.
• Individual author example: Sunshine, Sally.
• If there are 2 authors, place a comma after the first author's name, then type the word "and" and list the second author's name in first name-last name order. For example: Sunshine, Sally and Luna Wolfe.
• For more than 2 authors, type the first author's name and a comma followed by the abbreviation "et. al." For example: Sunshine, Sally, et. al.

• Example: New York City Department of Health and Mental Hygiene. "Community Health Profiles 2015, Brooklyn Community District 17: East Flatbush."

• Example: New York City Department of Health and Mental Hygiene. "Community Health Profiles 2015, Brooklyn Community District 17: East Flatbush." NYC.gov , New York City Department of Health and Mental Hygiene, 2015.
• If a specific date is provided, use day-month-year format, abbreviating months with names longer than 4 letters. For example: 22 Feb. 2016.

• URL example: New York City Department of Health and Mental Hygiene. "Community Health Profiles 2015, Brooklyn Community District 17: East Flatbush." NYC.gov , New York City Department of Health and Mental Hygiene, 2015. www1.nyc.gov/assets/doh/downloads/pdf/data/2015chp-bk17.pdf.
• DOI example: "Hazardous Drinking Rates, Drinkers Only, Population Aged 15-74." Tackling Harmful Alcohol Use: Economics and Public Health Policy , Organization for Economic Co-operation and Development, 24 Dec. 2015. OECD iLibrary , doi:10.1787/9789264181069-graph7-en.

• Example: New York City Department of Health and Mental Hygiene. "Community Health Profiles 2015, Brooklyn Community District 17: East Flatbush." NYC.gov , New York City Department of Health and Mental Hygiene, 2015. www1.nyc.gov/assets/doh/downloads/pdf/data/2015chp-bk17.pdf. Accessed 24 Jan. 2017.

MLA Works Cited Entry Format:

Author Last Name, First Name. "Title of Document: Subtitle if Any." Title of Website or Publication , Name of Publisher, Day-Month-Year published or last modified. URL/DOI. Accessed Day-Month-Year.

• For example, you might write: Statistics show 30 percent of the adult residents of East Flatbush are obese (New York City Department of Health and Mental Hygiene 9).
• If the source isn't paginated, you only need to provide the author's last name in the parenthetical citation.
• If you mention the author's name in your text, provide a page number in the parenthetical. For example, you might write: According to the New York City Department of Health and Mental Hygiene, 30 percent of the adult residents of East Flatbush are obese (9). If the source is not paginated, you don't need a parenthetical at all if you mention the author's name in your text.

• Example: National Center for Health Statistics.
• If there are 2 to 7 authors, list each name using the same last name-initials format. Place a comma between names and an ampersand before the final author's name. If there are more than 7 authors listed, place an ellipsis after the 6th author's name, then provide the last author's name. Never list more than 7 authors in an APA reference list entry. [4] X Trustworthy Source Purdue Online Writing Lab Trusted resource for writing and citation guidelines Go to source

• Example: National Center for Health Statistics. (2016).

• Example: National Center for Health Statistics. (2016). Health, United States, 2015: With special feature on racial and ethnic health disparities [Statistical report].
• Examples of possible descriptions include "statistical report," "data file," "dataset," "preliminary report," or "statistical analysis."
• If there is a version number, include it in parentheses between the title and the description.

• URL example: National Center for Health Statistics. (2016). Health, United States, 2015: With special feature on racial and ethnic health disparities [Statistical report]. Retrieved from https://www.cdc.gov/nchs/data/hus/hus15.pdf
• DOI example: Organization for Economic Co-operation and Development (2015). Hazardous drinking rates, drinkers only, population aged 15-74 [Statistical report]. Retrieved from doi: 10.1787/9789264181069-graph7-en

APA Reference List Format:

Author Last Name, A. A. (Year). Title of document: Subtitle if any (Version # if available) [Description of document]. Retrieved from URL/DOI

• For example, you might write: In 2014, life expectancy for males increased 1.4 years (National Center for Health Statistics, 2016).
• If you mention the author in the text of your paper, include the year in parentheses immediately after the author's name. For example, you might write: According to the National Center for Health Statistics (2016), life expectancy for males increased by 1.4 years in 2014.
• If you happen to mention both the author's name and the year of publication in the text of your paper, there's no need for a parenthetical citation unless you have directly quoted the source. In that case, you would include the page number in parentheses at the end of the sentence.

• Institutional author example: National Center for Health Statistics.
• Individual author example: Sunshine, Sally K.
• For 2 or 3 authors, list each author's name separated by commas with the word "and" before the final author's name All authors other than the first author are listed in first name-last name format. For example: Sunshine, Sally K. and Luna Wolfe.
• If there are more than 3 authors, type the first author's name followed by a comma and the abbreviation "et. al." For example: Sunshine, Sally K., et. al. [10] X Research source

• Example: National Center for Health Statistics. Health, United States, 2015: With Special Feature on Racial and Ethnic Disparities .

• Example: National Center for Health Statistics. Health, United States, 2015: With Special Feature on Racial and Ethnic Disparities . Washington, D.C.: U.S. Government Printing Office.

• Example: National Center for Health Statistics. Health, United States, 2015: With Special Feature on Racial and Ethnic Disparities . Washington, D.C.: U.S. Government Printing Office. Distributed by Hyattsville, MD: National Center for Health Statistics, 2016.

• URL Example: National Center for Health Statistics. Health, United States, 2015: With Special Feature on Racial and Ethnic Disparities . Washington, D.C.: U.S. Government Printing Office. Distributed by Hyattsville, MD: National Center for Health Statistics, 2016. https://www.cdc.gov/nchs/data/hus/hus15.pdf.
• DOI example: Organization for Economic Co-operation and Development. Hazardous Drinking Rates, Drinkers Only, Population Aged 15-74 . Paris, France: OECD iLibrary. doi: 10.1787/9789264181069-graph7-en.

Chicago Bibliography Format:

Author Last Name, First Name. Title of Document: Subtitle if Any. Location: Publisher. Distributed by Location: Distributor (if different from publisher), Year. URL/DOI.

• Example: National Center for Health Statistics, Health, United States, 2015: With Special Feature on Racial and Ethnic Disparities , (Washington, D.C.: U.S. Government Printing Office, distributed by Hyattsville, MD: National Center for Health Statistics, 2016) https://www.cdc.gov/nchs/data/hus/hus15.pdf, 65-86.

Expert Q&A

• If the statistics are reported in a book or journal article, rather than a statistical report or data set, cite to the book or journal article. There is no special format required because you're citing statistics rather than other content. Thanks Helpful 0 Not Helpful 0

You Might Also Like

• ↑ https://www.icpsr.umich.edu/files/ICPSR/enewsletters/iassist.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_in_text_citations_the_basics.html
• ↑ https://guides.library.ucsc.edu/citedata
• ↑ https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/reference_list_author_authors.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/in_text_citations_the_basics.html
• ↑ https://guides.lib.umich.edu/c.php?g=282964&p=3285995
• ↑ https://library.ulethbridge.ca/chicagostyle/books/multiple
• ↑ https://research.wou.edu/c.php?g=551307&p=3785233

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Cite data and statistics.

• How to Cite Data and Statistics
• Citing Sources

General Guidelines

When you use numeric datasets or a prepared statistical table you must cite where you retrieved the information.  Data and statistical tables contain unique elements not specifically addressed by most citation styles.  Citations for data or statistical tables should include at least the following pieces of information, which you will need to arrange according to the citation style you use.  

• Author or creator - the person(s), organization, issuing agency or agencies responsible for creating the dataset
• Date of publication  - the year the dataset was published, posted or otherwise released to the public (not the date of the subject matter).
• Title or description - complete title or  if no title exists, you must create a brief description of the data, including time period covered in the data if applicable
• Publisher  - entity (organization, database, archive, journal) responsible for hosting the data 
• URL or DOI   - the unique identifier if the data set is online

Certain styles may also ask for additional information such as:

• Edition or version
• Date accessed online (Note: APA does not require this)
• Format description e.g. data file, database, CD-ROM, computer software

Tips for finding additional citation guidance:

• Check to see if the publisher or distributor of your dataset provides suggestions for citing their data.  For example data providers like OECD and repositories like  ICPSR  and Dryad  offer guidance for formatting citations to the hundreds of datafiles they host or produce.
• Look through your style manual for instructions on using a similar format such as citation styles for electronic resources, electronic references, web pages, or tables.

This guide provides information for citing data and tables to include in your bibliography.  Consult the Purdue OWL for guidance on incorporating data and statistics in the body of your paper.

This guide is intended as a guideline only, check your citation manual, ask a librarian, or confer with your professor if your specific data set does not contain the elements needed to draft a useful citation. In general, it’s better to include more information than called for than to leave out information that could help the reader locate data you cite.

Examples - APA Style

Unless otherwise noted, the basic elements and guidelines described here are from the Publication Manual of the American Psychological Association, 6th edition (McHenry Reference Desk BF 76.7 .P83 2010).  You may also wish to consult the Purdue OWL  or How to Cite Data from Michigan State University for MLA examples and explanations.

1. Include format type in brackets [ ] to describe format , not title information (e.g. data set, data file and codebook).  [See APA guidelines for "Nonroutine information in titles" (pp. 186)]

2. Use “Available from” if the URL or DOI points you to a website or information on how to obtain or download data at a general site that houses data sets. Use “Retrieved from” if the URL or DOI takes you directly to the data table or database. (APA Style Manual, 2001 ed ., pp.281 or  Purdue OWL Electronic Sources : Data Sets)

Basic Elements:  [Follow APA guidelines for "Data set" (pp. 210-211) or online from MSU ] 

Author/Rightsholder, A. A. (Year). Title of publication or data set  (Version number if available) [Data File]. Retrieved from (or available from) http://xxxx

The title of the data set should be italicized unless the data set is included as part of a larger work or volume

The World Bank, World Development Indicators (2012). GNI per capita, Atlas method  [Data file]. Retrieved from http://data.worldbank.org/indicator/NY.GNP.PCAP.CD

Example of  Table generated from an interactive data set:

Bureau of Economic Analysis, U.S. Department of Commerce (2013).  U.S. Direct Investment Abroad, All U.S. Parent Companies 2009-2010 . [Data file].  Available from BEA.gov/iTable 

II. Table from a publication  

Basic Elements: [Follow APA guidelines for "entry in a reference work" (p. 205)] 

Author. (Year). Title of entry. In Editor (Edition),  Title of publication  (pp. xxx-xxx). Retrieved from http:// OR Location: Publisher OR doi:xxxx.

Example: (Note: Editor & Edition elements are not applicable in this example)

World Trade Organization. (2012). Table I.3: World merchandise trade and trade in commercial services by region and selected economy, 2005-2011.  In International Trade Statistics, 2012  (p. 22).  Retrieved from: http://www.wto.org/english/res_e/statis_e/its2012_e/its12_toc_e.htm

The title of the data set should be italicized unless the data set is included as part of a larger work or volume , as in the example above.  

Quick Guides to Citing Data

• ICPSR: How to Cite Data
• IASSIST Quick Guide to Citing Data
• How to Cite Data - Michigan State University A longer guide with many examples of how to cite datasets and statistical tables
• Writing with Statistics - Purdue OWL Explains how to properly incorporate statistics into a paper, including inferential and descriptive statistics, and using visuals: tables, graphs, and charts
• Census Data & Tables (American Factfinder)

What is a DOI?

DOI stands for Digital Object Identifier and is a unique number used to precisely locate electronic items like webpages, articles, files, etc.  A DOI is persistent, which means it does not "break" the way a URL can when a website is updated.

• See: What is a DOI? (ICPSR)
• Next: Citing Sources >>

Creative Commons Attribution 3.0 License except where otherwise noted.

Land Acknowledgement

The land on which we gather is the unceded territory of the Awaswas-speaking Uypi Tribe. The Amah Mutsun Tribal Band, comprised of the descendants of indigenous people taken to missions Santa Cruz and San Juan Bautista during Spanish colonization of the Central Coast, is today working hard to restore traditional stewardship practices on these lands and heal from historical trauma.

The land acknowledgement used at UC Santa Cruz was developed in partnership with the Amah Mutsun Tribal Band Chairman and the Amah Mutsun Relearning Program at the UCSC Arboretum .

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Citation Help

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Data requires citations for the same reasons journal articles and other types of publications require citations: to acknowledge the original author/producer and to help other researchers find the resource.

A dataset citation includes all of the same components as any other citation, and although data citation practices are still emerging, including data you use (or create) in your references section will allow others to locate it, and ensures that its use is captured correctly to become part of the scholarly record:

• year of publication,
• publisher (for data this is often the archive where it is housed),
• edition or version, and
• access information (a URL or other persistent identifier).

Unfortunately, standards for the citation of data are not uniformly agreed upon and have yet to be codified by the National Information Standards Organization (an organization that sets technical standards for other bibliographic materials).  However, many data providers and distributors and some style manuals do provide guidelines.  Some of these instructions are listed on this guide.

Be sure to follow the general citation format for the style manual your professor has asked you to use.  It is always better to provide more information about a resource rather than less!

General Rules

Some style manuals do provide instructions for the citation of data, and selected examples are listed on the Data Citations tab.  If the style manual you are using does not address data citations, you can follow these general rules.

Usually a style manual will lay out basic rules for the order of citation elements, regardless of the type of work.  This is what you will need to pay close attention to in order to format your citation correctly.  If you can’t find a generic list of rules, then look at how the citation for a book is formatted. 

These are the citation elements you need to consider when building a data citation:

Who is the creator of the data set?  This can be an individual, a group of individuals, or an organization.

What name is the data set called, or what is the name of the study? 

Edition or Version

Is there a version or edition number associated with the data set?

What year was the data set published?  When was the data set posted online?

Is there a person or team responsible for compiling or editing the data set?

Publisher and Publisher Location

What entity is responsible for producing and/or distributing the data set?  Also, is there a physical location associated with the publisher? 

In some cases, the publisher of a data set is different than how we think of the publisher of a book.  A data set can have both a producer and a distributor.

The producer is the organization that sponsored the author’s research and/or the organization that made the creation of the data set possible, such as codifying and digitizing the data.

The distributor is the organization that makes the data set available for downloading and use. 

You may need to distinguish the producer and the distributor in a citation by adding explanatory brackets, e.g., [producer] and [distributor].

Some citation styles (e.g., APA) do not require listing the publisher if an electronic retrieval location is available.  However, you may consider including the most complete citation information possible and retaining publisher information even in the case of electronic resources.

Material Designator

What type of file is the data set?  Is it on CD or online? 

This may or may not be a required field depending on the style manual.  Often this information is added in explanatory brackets, e.g. [computer file].

Electronic Retrieval Location

What web address is the data set available at?  Is there a persistent identifier available?  If a DOI or other persistent identifier is associated with the data set it should be used in place of the URL.

Examples using the General Rules

Apa (6th edition).

Minimum requirements based on instructions and example for dataset reference:

Milberger, S. (2002). Evaluation of violence against women with physical disabilities in Michigan, 2000-2001 (ICPSR version) [data file and codebook]. doi:10.3886/ICPSR03414

With optional elements:

Milberger, S. (2002). Evaluation of violence against women with physical disabilities in Michigan, 2000-2001 (ICPSR version) [data file and codebook]. Detroit: Wayne State University [producer]. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor]. doi:10.3886/ICPSR03414

MLA (7th edition)

Minimum requirements based on instructions and examples for books and web publications:

Milberger, Sharon. Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Inter-university Consortium for Political and Social Research, 2002. Web. 19 May 2011.

Milberger, Sharon. Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Detroit: Wayne State U [producer]. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2002. Web. 19 May 2011. doi:10.3886/ICPSR03414

Chicago (16th edition)

Bibliography style (based on documentation for books):

Milberger, Sharon. Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Detroit: Wayne State University, 2002. Distributed by Ann Arbor, MI: Inter-University Consortium for Political and Social Research, 2002. doi:10.3886/ICPSR03414.

Author-Date style:

Milberger, Sharon. 2002. Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Detroit: Wayne State University. Distributed by Ann Arbor, MI: Inter-University Consortium for Political and Social Research. doi:10.3886/ICPSR03414.

Citing Census Data and Maps

When you make a table in data.census.gov you can click on "More Tools" in the upper right corner and then select Cite

Basic Format for APA 6th edition

U.S. Census Bureau (year data was published).  Name of data or report.  Retrieved from [URL].

Chicago Style 16th ed.

United States Census Bureau. Name of  Table . Data.Census.Gov <URL> (The date the Table was generated)

• Citing Census Data in Social Explorer Guidance on citing census data in Social Explorer for APA, Chicago and MLA styles

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Citing Data and Statistics

Guide to data citation.

Whether you use a numeric dataset or a prepared statistical table from an existing source (print or electronic) you need to cite the source of your information.  

It is critical to correctly cite data and statistics. This ensures that research data and statistics can be:

• replicated for verification
• credited for recognition
• tracked to measure usage and impact

By citing your dataset or statistics, you ensure that your work can be reproduced, and you also attribute credit to those who provided the data or statistics.

Elements of Data Citation

It is important to identify the elements of your data and statistics, as these elements are organized into a properly formatted citation in accordance with your associations preferred style guide.

These are the minimum elements required for dataset identification and retrieval. Fewer or additional elements may be requested by author guidelines or style manuals. Be sure to include as many elements as needed to precisely identify the dataset or statistics you have used.

Arrange these elements following the order and punctuation specified by your style guide. If examples for datasets are not provided, the format for books is generally considered a generic format that can be modified for other source types.

Source: Quick Guide to Data Citation - IASSIST Special Interest Group on Data Citation (SIGDC)

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• Last Updated: Apr 11, 2024 10:55 AM
• URL: https://guides.library.jhu.edu/data-stats

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Guidelines and Tools for Citing Data

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Data citation is an invaluable tool of scholarly work. For authors of datasets, it is important that they receive attribution for their work. Citing data also allows readers to locate, access and reuse the data for their own use or for replication.

When citing data, the following components should be used:

• Author name(s)
• Title or name of dataset
• Publication or release date
• Publisher name (i.e. database, repository)
• Edition, version, volume, vintage
• Software used for analysis
• Access information (URL, unique identifier, access date)

Always try to provide as much information as possible.

There is no one standard method for citing data. Many of the data repositories, archives, distributors or publishers have provided their own guidelines to assist researchers.

• Dataverse :  ​ Hanmer, Michael J.; Banks, Antoine J., White, Ismail K., 2013, "Replication data for: Experiments to Reduce the Over-reporting of Voting: A Pipeline to the Truth", http://dx.doi.org/10.7910/DVN/22893 , Harvard Dataverse, V2 [UNF:5:eJOVAjDU0E0jzSQ2bRCg9g==]
• Dryad : Sidlauskas, B. 2007. Data from: Testing for unequal rates of morphological diversification in the absence of a detailed phylogeny: a case study from characiform fishes. Dryad Digital Repository. doi:10.5061/dryad.20
• Zenodo : Franco, Luis et al (2013). "interactive" version of data associated with the eLife paper "Integrative genomic analysis of the human immune response to influenza vaccination." eLife: (2013) pp. 00299. 10.5281/zenodo.6960
• Roper Center

See also the DOI Citation Formatter from CrossRef

Note: Some sites may require further attribution such as the GES DISC .

Bibliographic & Data Citation Tools

Further Reading

Peter Buneman, "How to cite curated databases and how to make them citable," ssdbm, pp.195-203, 18th International Conference on Scientific and Statistical Database Management (SSDBM'06), 2006. Retrieved from http://homepages.inf.ed.ac.uk/opb/papers/ssdbm2006.pdf . Altman, M., & King, G. (2007). A proposed standard for the scholarly citation of quantitative data. D-Lib Magazine , 13(3/4).  Retrieved from http://dx.doi.org/10.1045/march2007-altman Green, T. (2009). We need publishing standards for datasets and data tables. OECD Publishing White Paper. Paris: OECD Publishing. Retrieved from http://dx.doi.org/10.1787/603233448430

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If you’re quoting or referring to statistics in your academic papers, the short and simple answer is, yes, of course, you should always cite your sources. This will allow your reader—usually your lecturer—to check the statistic for themselves with a clear point of reference for reviewing the relevant study in more detail if they wish.

But What If It’s Common Knowledge?

Even if you’re referring to something that’s often quoted and could be considered common knowledge—for example, that 50% of marriages end in divorce, or that 80% of businesses fail in their first year—you should still back this up by quoting a study from a reputable source. You might even find that your “common knowledge” statistic isn’t as reliable as you originally thought.

So How Do I Cite a Statistic?

Assuming that you’ve found a reliable source for the statistic that you’re quoting or referring to, you now need to create a citation to point to that source. How you do this will depend on the citation format that you’re required to use and the actual source type of the statistic. Once you know whether you’re expected to cite your sources in MLA or APA style , citing a statistic is essentially no different from citing anything else from that particular type of source.

For example, if you took the statistic from a website, you cite it as you would any other website. The same goes for statistics found in books, journals, magazines, or databases—simply follow the usual citation method for each source.

Here is an example of a statistic found online and cited in MLA style (9 th Edition)

Full Citation Structure

Author’s last name, First name. “Title of Document/Webpage: Subtitle.” Title of Website, Publisher/Affiliated organization, Date published, URL.

More females than males attended college/university in the US in 2017.

Full Citation in Works Cited List

“Table 105.20: Enrollment in Elementary, Secondary, and Degree-Granting Postsecondary Institutions, by Level and Control of Institution, Enrollment Level, and Attendance Status and Sex of Student: Selected Years, Fall 1990 through Fall 2026.” Digest of Education Statistics , National Center for Education Statistics, February 2017, https://nces.ed.gov/programs/digest/d16/tables/dt16_105.20.asp?current=yes.

Note the above example does not have author information available, so the citation starts with the title of the document. Also, the citation provides information for an individual data table on a webpage, rather than simply the webpage itself.

In-text Citation

An in-text citation in MLA is a parenthetical citation . The standard format for this citation is:

(Author, page number)

Creating an in-text citation for a webpage can be tricky due to the absence of page numbers (and, in this case, the absence of an author). The advice for MLA format is to include the first item of your full citation, whatever that may be. This will enable the reader to easily identify the full citation, which is, of course, the point of an in-text citation. You can condense the item if necessary.

So, for the above example, the in-text citation would be:

(“Table 105.20”)

That Seems Like A Lot of Information!

Generally, the more information you can give on a resource the better—so if it’s available, include it. However, it’s understood that sometimes you might have to leave some components out. If you follow the format as instructed by your lecturer and include enough information to enable them to find your sources, your citation should be correct.

Remember! Don’t rely on “common knowledge” to cite statistics. Your lecturer will want to see firm sources to validate those statistics. Citation Machine can help with quick citation creation, making it easy to back up those statistics with properly referenced sources. There are thousands of styles including the Chicago Manual of Style and many others.

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Data citation: data citation, data citation.

Data sources require citation just as any other type of publication.  Citation provides due acknowledgement to the original creator, and allows other researchers to find, verify and reuse data. 

There are not universal standards for the citation of data sets, although style guides increasingly provide guidance.  General guidelines for citation strategy should include:

Author – Who created the Data.

Title – What is the name of the data set or study?

Date of publication

Edition or version

Publisher and Place of publication

Distributor – if different from publisher

Format - What type of file or media is it?

Persistent Identifier – is there a web address this is available at? May be Digital Object Identifier or Uniform Resource Locator.

Examples from various style guides

APA (6th edition)

Minimum requirements based on instructions and example for dataset reference:

Milberger, S. (2002).  Evaluation of violence against women with physical disabilities in Michigan, 2000-2001  (ICPSR version) [data file and codebook]. doi:10.3886/ICPSR03414

With optional elements:

Milberger, S. (2002).  Evaluation of violence against women with physical disabilities in Michigan, 2000-2001  (ICPSR version) [data file and codebook]. Detroit: Wayne State University [producer]. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor]. doi:10.3886/ICPSR03414

MLA (7th edition)

Minimum requirements based on instructions and examples for books and web publications:

Milberger, Sharon.  Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Inter-university Consortium for Political and Social Research, 2002. Web. 19 May 2011.

Milberger, Sharon.  Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Detroit: Wayne State U [producer]. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2002. Web. 19 May 2011. doi:10.3886/ICPSR03414

Chicago (16th edition)

Bibliography style (based on documentation for books):

Milberger, Sharon.  Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Detroit: Wayne State University, 2002. Distributed by Ann Arbor, MI: Inter-University Consortium for Political and Social Research, 2002. doi:10.3886/ICPSR03414.

Author-Date style:

Milberger, Sharon. 2002.  Evaluation of Violence Against Women With Physical Disabilities in Michigan, 2000-2001 . ICPSR version. Detroit: Wayne State University. Distributed by Ann Arbor, MI: Inter-University Consortium for Political and Social Research. doi:10.3886/ICPSR03414.

American Chemical Society's Style for Printed Data Sets Rind, D. 1994. General Circulation Model Output Data Set. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #1994-012. NOAA/NCDC Paleoclimatology Program, Boulder, Colorado, USA.

G eoscience  Information Society's Style for Data Sets  Defosse, G.E., and M. Bertiller. 1998. NPP Grassland: Media Luna, Argentina, 1981-1983. Data set. Available on-line [http://www.daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

Tables, charts, graphs, maps, or figures appearing in a publication United States Bureau of the Census. "Table 151. Retail Prescription Drug Sales: 1995 to 2007."  Statistical Abstract of the United States. Year: 2009. http://www.census.gov/compendia/statab/tables/09s0151.pdf. Accessed: 11/4/09.

Interactive Database with static URLs United States Bureau of the Census. "P3. RACE [71] - Universe: Total Population." Dataset: Summary File 1.  American FactFinder.  Year: 2000. http://factfinder.census.gov/servlet/DTTable?_bm=y&-geo_id=01000US&-ds_name=DEC_2000_SF1_U&-_lang=en&-mt_name=DEC_2000_SF1_U_P003&-format=&-CONTEXT=dt. Accessed: 11/04/09.

Interactive Database without static URLs Bureau of Economic Analysis. "Per Capita real GDP by state (chained 2000 dollars)." Dataset: Gross Domestic Product by State. Parameters: all industry total, 2008, all states and regions.  Regional Economic Accounts. Date Generated: 11/04/09.

Links/ Other Guides

Inter-university Consortium for Political and Social Research (ICPSR) 

Geoscience Information Society

Michigan State University Libraries  

University of Minnesota Libraries

GIS/Metadata Librarian

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Subject Specialist

It is important to cite not only the literature consulted but also the data or statistics used. The elements of a data/statistics citation include:

• Author(s)/Creator
• Year of publication: The date when the statistics/dataset was published or released (rather than the collection or coverage date)
• Publisher: the data center/repository
• Any applicable identifier (including edition or version)
• Availability and access: URL or other location information for the data/statistics

The following links provide you with useful guides to citing statistical data. Use these along with the citation style guide recommended by your instructor.

Statistics Canada's Guide " How to Cite Statistics Canada Products "

How to Cite Data   (UBC Library)

• Academic Integrity: APA Style Plagiarism is a big deal, and it’s not something you want to find out about the hard way. In this tutorial you will not only learn how to avoid plagiarism, but also pick up some good research tips too.
• Academic Integrity: MLA Style
• Academic Integrity: Vancouver Style
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Citing sources: Cite data

• Citation style guides

Manage your references

Use these tools to help you organize and cite your references:

• Citation Management and Writing Tools

If you have questions after consulting this guide about how to cite, please contact your advisor/professor or the writing and communication center .

Cite data in your paper/presentation so that you can:

• Give the data producer appropriate credit
• Enable readers of your work to access the data, for their own use and to replicate your results
• Fulfills some publisher requirements

Include in your citation:

• Year of publication
• Publisher or distributor
• URL, identifier, or other access location

Using citation software or style guides ? In Endnote use the reference type for "dataset." If you're using Mendeley or Zotero, make due with using other more generic reference type templates and fill in the essentials for your dataset.

Cite data: examples

Want detailed guidelines for citing data?  See:

• Quick Guide to Data Citation (IASSIST)
• How to Cite Data (MSU)
• How to Cite Datasets and Link to Publications (DCC)

Examples of data citations include:

• Bachman, Jerald G., Lloyd D. Johnston, and Patrick M. O'Malley. Monitoring the Future: A Continuing Study of American Youth (12th-Grade Survey), 1998 [Computer file]. Conducted by University of Michigan, Survey Research Center. ICPSR02751-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [producer and distributor], 2006-05-15. http://dx.doi.org/10.3886/ICPSR02751 .
• ASTER Global Digital Elevation Model, version 1, ASTGTM_N11E122_num.tif, ASTGTM_N11E123_num.tif, Ministry of Economy, Trade, and Industry (METI) of Japan and NASA, downloaded from https://wist.echo.nasa.gov/api/ , October 27, 2009
• Cite a subject archive entry, e.g.: Genbank accession number, available at: http://www.ncbi.nlm.nih.gov .

Data archives may provide guidelines on how to cite the data, e.g.,:

• Data catalogs like the Harvard Dataverse Network and ICPSR have standard citations included in the study record.
• ICPSR: Why and how should I cite data?
• How to Cite Roper Center Data
• Dryad Good Data Practices
• Earth Science Information Partner Federation Data Stewardship/Citations
• NOAA Paleoclimatology Program: Data Citation
• PANGEA Citation
• Citing and linking to the Gene Expression Omnibus (NCBI) database

Cite data using Zotero

As Zotero lacks an "item type" for datasets, enter the citation in the system as a "Document," depending upon if/how the data producer provides a recommended citation; either:

• Export an RIS file and import this file into Zotero
• Copy and paste the information from a recommended citation into a new Zotero item with the type "Document"
• Otherwise, use the "Document" item type to add the components of the citation
• << Previous: Citation style guides
• Last Updated: Jan 16, 2024 7:02 AM
• URL: https://libguides.mit.edu/citing

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• Referencing

A Quick Guide to Referencing | Cite Your Sources Correctly

Referencing means acknowledging the sources you have used in your writing. Including references helps you support your claims and ensures that you avoid plagiarism .

There are many referencing styles, but they usually consist of two things:

• A citation wherever you refer to a source in your text.
• A reference list or bibliography at the end listing full details of all your sources.

The most common method of referencing in UK universities is Harvard style , which uses author-date citations in the text. Our free Harvard Reference Generator automatically creates accurate references in this style.

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Table of contents

Referencing styles, citing your sources with in-text citations, creating your reference list or bibliography, harvard referencing examples, frequently asked questions about referencing.

Each referencing style has different rules for presenting source information. For in-text citations, some use footnotes or endnotes , while others include the author’s surname and date of publication in brackets in the text.

The reference list or bibliography is presented differently in each style, with different rules for things like capitalisation, italics, and quotation marks in references.

Your university will usually tell you which referencing style to use; they may even have their own unique style. Always follow your university’s guidelines, and ask your tutor if you are unsure. The most common styles are summarised below.

Harvard referencing, the most commonly used style at UK universities, uses author–date in-text citations corresponding to an alphabetical bibliography or reference list at the end.

Harvard Referencing Guide

Vancouver referencing, used in biomedicine and other sciences, uses reference numbers in the text corresponding to a numbered reference list at the end.

Vancouver Referencing Guide

APA referencing, used in the social and behavioural sciences, uses author–date in-text citations corresponding to an alphabetical reference list at the end.

APA Referencing Guide APA Reference Generator

MHRA referencing, used in the humanities, uses footnotes in the text with source information, in addition to an alphabetised bibliography at the end.

MHRA Referencing Guide

OSCOLA referencing, used in law, uses footnotes in the text with source information, and an alphabetical bibliography at the end in longer texts.

OSCOLA Referencing Guide

Prevent plagiarism, run a free check.

In-text citations should be used whenever you quote, paraphrase, or refer to information from a source (e.g. a book, article, image, website, or video).

Quoting and paraphrasing

Quoting is when you directly copy some text from a source and enclose it in quotation marks to indicate that it is not your own writing.

Paraphrasing is when you rephrase the original source into your own words. In this case, you don’t use quotation marks, but you still need to include a citation.

In most referencing styles, page numbers are included when you’re quoting or paraphrasing a particular passage. If you are referring to the text as a whole, no page number is needed.

In-text citations

In-text citations are quick references to your sources. In Harvard referencing, you use the author’s surname and the date of publication in brackets.

Up to three authors are included in a Harvard in-text citation. If the source has more than three authors, include the first author followed by ‘ et al. ‘

The point of these citations is to direct your reader to the alphabetised reference list, where you give full information about each source. For example, to find the source cited above, the reader would look under ‘J’ in your reference list to find the title and publication details of the source.

Placement of in-text citations

In-text citations should be placed directly after the quotation or information they refer to, usually before a comma or full stop. If a sentence is supported by multiple sources, you can combine them in one set of brackets, separated by a semicolon.

If you mention the author’s name in the text already, you don’t include it in the citation, and you can place the citation immediately after the name.

• Another researcher warns that the results of this method are ‘inconsistent’ (Singh, 2018, p. 13) .
• Previous research has frequently illustrated the pitfalls of this method (Singh, 2018; Jones, 2016) .
• Singh (2018, p. 13) warns that the results of this method are ‘inconsistent’.

The terms ‘bibliography’ and ‘reference list’ are sometimes used interchangeably. Both refer to a list that contains full information on all the sources cited in your text. Sometimes ‘bibliography’ is used to mean a more extensive list, also containing sources that you consulted but did not cite in the text.

A reference list or bibliography is usually mandatory, since in-text citations typically don’t provide full source information. For styles that already include full source information in footnotes (e.g. OSCOLA and Chicago Style ), the bibliography is optional, although your university may still require you to include one.

Format of the reference list

Reference lists are usually alphabetised by authors’ last names. Each entry in the list appears on a new line, and a hanging indent is applied if an entry extends onto multiple lines.

Different source information is included for different source types. Each style provides detailed guidelines for exactly what information should be included and how it should be presented.

Below are some examples of reference list entries for common source types in Harvard style.

• Chapter of a book
• Journal article

Your university should tell you which referencing style to follow. If you’re unsure, check with a supervisor. Commonly used styles include:

• Harvard referencing , the most commonly used style in UK universities.
• MHRA , used in humanities subjects.
• APA , used in the social sciences.
• Vancouver , used in biomedicine.
• OSCOLA , used in law.

Your university may have its own referencing style guide.

If you are allowed to choose which style to follow, we recommend Harvard referencing, as it is a straightforward and widely used style.

References should be included in your text whenever you use words, ideas, or information from a source. A source can be anything from a book or journal article to a website or YouTube video.

If you don’t acknowledge your sources, you can get in trouble for plagiarism .

To avoid plagiarism , always include a reference when you use words, ideas or information from a source. This shows that you are not trying to pass the work of others off as your own.

You must also properly quote or paraphrase the source. If you’re not sure whether you’ve done this correctly, you can use the Scribbr Plagiarism Checker to find and correct any mistakes.

Harvard referencing uses an author–date system. Sources are cited by the author’s last name and the publication year in brackets. Each Harvard in-text citation corresponds to an entry in the alphabetised reference list at the end of the paper.

Vancouver referencing uses a numerical system. Sources are cited by a number in parentheses or superscript. Each number corresponds to a full reference at the end of the paper.

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Citing Data |  Data Availability Statements | Citing Code

Cite Your Own Data

Are you publishing a paper referencing your research data? Include a reference to your data in the text of the paper with a data availability statement and add a data citation to your references section.

This will ensure that the data citation becomes part of the scholarly record and provides pathways for others to find your work. Research funders also want you to share data and a citation is proof of your data being shared.

If you are depositing data with the UI, we can reserve a DOI for your dataset, so you can include it in the article submission. We can also assist with sharing and publishing data.  More here

Cite Others’ Data

Give credit to other data sources when you use them, just as you do when using published literature. Whether for a paper or a presentation, it’s important to cite the data files used.

Citation Elements for Data

A data citation should include at least the following elements. The specific information will depend on established practices in your research field, as well as the type of data, the repository you use, and the citation style of the publication.

• Responsible party (i.e., investigator, sample collector, creator)
• Title of dataset
• Date of publication of the dataset
• Version, when appropriate
• Name of data center, repository, and/or publication
• Analysis software, if required
• Date accessed
• Identifier (e.g., DOI or other persistent link)

Tip: Citation formatters If you have a DOI, you can use the CrossCite DOI data citation formatter  or the  DataCite citation formatter  to create citations corresponding to a variety of citation styles.

Most data repositories will provide a suggested citation for their datasets. Some will also request that you cite the related publication(s) along with the data. Follow the most appropriate format while meeting the requirements of the data creators and repositories.

Guidelines and Examples

Citation style guides/manuals are beginning to include data as a resource type. The Citation Formatters (above) will provide the information in a style that approximates style requirements, so you may want to confirm that those generated citations completely follow a particular citation style guide.

Here are some examples of guidelines:

• American Geophysical Union (AGU)  author guidelines  for citing data sets
• Federation of Earth Science Information Partners (ESIP) Interagency Data Stewardship/Citations
• Citing and linking to the Gene Expression Omnibus (NCBI) database
• Using data in  Dryad
• The Inter-university Consortium for Political and Social Research (ICPSR) provides recommended citation procedures
• DataCite citation examples

Data Availability Statements

If you’re publishing an article using your research data, the journal may require a data availability statement that briefly describes if and how readers can access the data that informs the research. The chart below shows some sample language you might use for a data availability statement. More examples of template data availability statements, which include examples of openly available and restricted access datasets, are from several publishers, including Taylor & Francis and Cambridge University Press .

The chart above is adapted from the article cited below and licensed under a Creative Commons Attribution license (CC-BY): Hrynaszkiewicz, I, Simons, N, Hussain, A, Grant, R and Goudie, S. 2020. “Developing a Research Data Policy Framework for All Journals and Publishers.” Data Science Journal , DOI: http://doi.org/10.5334/dsj-2020-005

Citing code (your own and that of others) is equally important as citing data, and for similar reasons: you’re providing appropriate credit, facilitating reproducibility, and ensuring future researchers can find and use the code.

Citation Elements for Code

• Creator (i.e., authors or organization who developed the software)
• Date of publication
• Publisher (e.g., repository name)

The Force11 Software Citation Implementation Working Group has created principles for software citation. Their GitHub page shows examples of citing software in both APA and Chicago Style.

Database Information in References

Database information is seldom provided in reference list entries. The reference provides readers with the details they will need to perform a search themselves if they want to read the work—in most cases, writers do not need to explain the path they personally used.

Think of it this way: When you buy a book at a bookstore or order a copy off the internet, you do not write the name of the (online) bookstore in the reference. And when you go to the library and get a book off the shelf, you do not write the name of the library in the reference. It is understood that readers will go to their bookstore or library of choice to find it.

The same is true for database information in references. Most periodicals and books are available through a variety of databases or platforms as well as in print. Different readers will have different methods or points of access, such as university library subscriptions. Most of the time, it does not matter what database you used, so it is not necessary to provide database information in references.

However, there are a few cases when it is necessary for readers to retrieve the cited work from a particular database or archive, either because the database publishes original, proprietary content or because the work is of limited circulation. This page explains how to write references for works from academic research databases and how to provide database information in references when it is necessary to do so.

Database information in references is covered in the seventh edition APA Style manuals in the Publication Manual Section 9.30 and the Concise Guide Section 9.30

Related handout

• Creating an APA Style Reference List (PDF, 179KB)

Works from academic research databases

Do not include database information for works obtained from most academic research databases or platforms because works in these resources are widely available. This includes journal articles, books, and book chapters from academic research databases.

• Examples of academic research databases and platforms include APA PsycNet, PsycInfo, Academic Search Complete, CINAHL, Ebook Central, EBSCOhost, Google Scholar, JSTOR (excluding its primary sources collection because these are works of limited distribution), MEDLINE, Nexis Uni, Ovid, ProQuest (excluding its dissertations and theses databases because dissertations and theses are works of limited circulation), PubMed Central (excluding authors’ final peer-reviewed manuscripts because these are works of limited circulation), ScienceDirect, Scopus, and Web of Science.
• When citing a work from one of these databases or platforms, do not include the database or platform name in the reference list entry unless the work falls under one of the exceptions described next ( databases with original, proprietary content and works of limited circulation ).
• Likewise, do not include URLs from these academic research databases in reference list entries because these URLs will not resolve for readers.
• Instead of a database URL, include a DOI if the work has one. If a widely available work (e.g., journal article, book, book chapter) from an academic research database does not have a DOI, treat the work as a print version. See the guidelines for how to include DOIs and URLs in references for more information.

The following example shows how to create a reference list entry for a journal article with a DOI from an academic research database.

Hallion, M., Taylor, A., Roberts, R., & Ashe, M. (2019). Exploring the association between physical activity participation and self-compassion in middle-aged adults. Sport, Exercise, and Performance Psychology , 8 (3), 305–316. https://doi.org/10.1037/spy0000150

• Parenthetical citation: (Hallion et al., 2019)
• Narrative citation: Hallion et al. (2019)

If the article did not have a DOI, the reference would simply end after the page range, the same as the reference for a print work.

Databases with original, proprietary content

Provide the name of the database or archive when it publishes original, proprietary works available only in that database or archive (e.g., UpToDate or the Cochrane Database of Systematic Reviews). Readers must retrieve the cited work from that exact database or archive, so include information about the database or archive in the reference list entry.

References for works from proprietary databases are similar to journal article references. The name of the database or archive is written in italic title case in the source element, the same as a periodical title, and followed by a period. After the database or archive information, also provide the DOI or URL of the work . If the URL is session-specific (meaning it will not resolve for readers), provide the URL of the database home page or login page instead.

The following example shows how to create a reference list entry for an article from the UpToDate database:

Stein, M. B., & Taylor, C. T. (2019). Approach to treating social anxiety disorder in adults. UpToDate . Retrieved September 13, 2019, from https://www.uptodate.com/contents/approach-to-treating-social-anxiety-disorder-in-adults

• Parenthetical citation: (Stein & Taylor, 2019)
• Narrative citation: Stein and Taylor (2019)

Works of limited circulation

Provide the name of the database or archive for works of limited circulation, such as dissertations and theses, manuscripts posted in a preprint archive, and monographs in ERIC. The database may also contain works of wide circulation, such as journal articles—only the works of limited circulation need database information in the reference.

References for works of limited circulation from databases or archives are similar to report references. The name of the database or archive is provided in the source element (in title case without italics ), the same as a publisher name, and followed by a period. After the database or archive information, also provide the DOI or URL of the work. If the URL is session-specific (meaning it will not resolve for readers), provide the URL of the database home page or login page instead.

The following are examples of works of limited circulation from databases or archives (for additional examples, see Section 9.30 of the Publication Manual ):

• dissertations and theses published in ProQuest Dissertations and Theses Global

Risto, A. (2014). The impact of social media and texting on students’ academic writing skills (Publication No. 3683242) [Doctoral dissertation, Tennessee State University]. ProQuest Dissertations and Theses Global.

• Parenthetical citation: (Risto, 2014)
• Narrative citation: Risto (2014)
• manuscripts posted in a preprint archive such as PsyArXiv

Inbar, Y., & Evers, E. R. K. (2019). Worse is bad: Divergent inferences from logically equivalent comparisons . PsyArXiv. https://doi.org/10.31234/osf.io/ueymx

• Parenthetical citation: (Inbar & Evers, 2014)
• Narrative citation: Inbar and Evers (2014)
• monographs published in ERIC

Riegelman, R. K., & Albertine, S. (2008). Recommendations for undergraduate public health education (ED504790). ERIC. https://files.eric.ed.gov/fulltext/ED504790.pdf

• Parenthetical citation: (Riegelman & Albertine, 2008)
• Narrative citation: Riegelman and Albertine (2008)

If you are in doubt as to whether to include database information in a reference, refer to the template for the reference type in question (see Chapter 10 of the Publication Manual ).

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APA Citations 7th Edition

• Why, When, and How to Cite
• General Tips & Sample Reference List
• Cite Books, Edited Book Chapters, and Entries From Reference Books
• Cite Journal, Magazine, Newspaper, and Blog Articles
• Cite Audiovisual, Audio, and Visual Works
• Cite Social Media and Webpages; and Guidance on Websites
• In-Text Citations
• Additional Help

Why to Cite

There are many reasons to cite your sources:

• to give credit to authors or artists whose work you have used
• to allow people who are reviewing your work to check your sources
• to show readers how you came up with your arguments or ideas
• to provide scholars with other sources for their research
• to avoid plagiarism

For more information about the dangers of plagiarism see the APA Blog .

For a quick overview of why  and when  to cite, view this short video, Cite a Source: How and Why You Should Do It .

Test your understanding of plagiarism by taking this short Plagiarism Quiz .

What you don't know CAN hurt you!

When to Cite

Cite a source when:

• you copy information exactly from it; t his includes primary sources, such as when you have interviewed someone or are referring to a work of art or image that you are referencing
• you paraphrase, summarize or use your own words to describe ideas from a work
• you cite statistics, data or other numerical information that was compiled by someone other than yourself.

​ NOTE: The exception to the rule is that you do not have to cite a source when you are using what is considered "common knowledge," such as a date in history, basic biographical facts about a prominent person, or the dates and circumstances of major historical events (e.g. there are 12 months in a year, the planets revolve around the sun, the American Civil War began on April 12, 1861, etc.). If the facts are in dispute, it is best to cite sources.

How to Cite

The essential components of APA citation style are the reference list and related in-text citations. These two components work together to allow readers to find the exact sources used by the writer, as well as where in the paper these sources were used.

The reference list is the master list of all sources used, and is located after the body of the paper. Each source has its own entry on the list and is written in a highly stylized format. The four basic elements of a reference are:

Author. (Date). Title. Source.

For example, here is a citation for an article from a magazine which contains the four basic elements along with additional elements needed to accurately describe a magazine article:

Chesney, R., & Citron, D. (2019, January/February). Deepfakes and the new disinformation war: The coming age of post-truth geopolitics. Foreign Affairs , 98 (1), 147–155.

When sources are used in the body of the paper, in-text citations are the link back to the exact entry for the source appearing on the reference list. For example, when the above source is quoted in the body of the paper it includes an embedded in-text citation:

Chesney (2019) speculates that "as deepfake technology develops and spreads, the current disinformation wars may soon look like the propaganda equivalent of the era of swords and shields."

Kinds of Sources

How to cite a source in the reference list is determined by the kind of source it is. APA citation style organizes sources into reference groups , then categories , and then types . The essential groups /categories / types covered in this guide are:

The one remaining group APA recognizes, "data sets, software, and tests," is not covered in this guide.

For more in-depth information on APA groups / categories / types, with examples, visit this APA Style Blog page .

NOTE: When selecting a group / category / type for a source, what group / category / type a source falls into is of more importance than how it happened to be accessed. For example, if you wanted to cite an article from a journal, when selecting a category/group/type the deciding factor would be that it was an article from a journal, not that you read it in print, or in a library research database, or on a website.  

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MLA In-text Citations and Sample Essay 9th Edition

Listing your sources at the end of your essay in the Works Cited is only the first step in complete and effective documentation. Proper citation of sources is a two-part process . You must also cite, in the body of your essay, the source your paraphrased information or where directly quoted material came from. These citations within the essay are called in-text citations . You must cite all quoted, paraphrased, or summarized words, ideas, and facts from sources. Without in-text citations, you are in danger of plagiarism , even if you have listed your sources at the end of the essay. In-text citations point the reader to the sources’ information in the works cited page, so the in-text citation should be the first item listed in the source’s citation on the works cited page, which is usually the author’s last name (or the title if there is no author) and the page number, if provided.

Two Ways to Cite Your Sources In-text

Parenthetical citation.

Cite your source in parentheses at the end of quoted or paraphrased material.

Example with a page number: In regards to paraphrasing, "It is important to remember to use in-text citations for your paraphrased information, as well as your directly quoted material" (Habib 7).

Example without a page number : Paraphrasing is "often the best choice because direct quotes should be reserved for source material that is especially well-written in style and/or clarity" (Ruiz).

Signal Phrase

Within the sentence, through the use of a "signal phrase" which signals to the reader the specific source the idea or quote came from. Include the page number(s) in parentheses at the end of the sentence, if provided.

Example with a page number: According to Habib, "It is important to remember to use in-text citations for your paraphrased information, as well as your directly quoted material" (7).

Example without a page number: According to Ruiz, paraphrasing is "often the best choice because direct quotes should be reserved for source material that is especially well-written in style and/or clarity."

*See our handout "Signal Phrases" for more examples and information on effective ways to use signal phrases for in-text citations.

Do you need to include a page number in your in-text citation?

Printed materials such as books, magazines, journals, or internet and digital sources with PDF files that show an actual printed page number need to have a page number in the citation.

Internet and digital sources with a continuously scrolling page without a page number do not need a page number in the citation.

Commonly used in-text citations in parentheses

Notes on Quotes

Block quotation format.

When using long quotations that are over four lines of prose or over three lines of poetry in length, you will need to use block quotation format. Block format is indented one inch from the margin (you can hit the "tab" button twice to move it one inch). Additionally, block quotes do not use quotation marks, and the parenthetical citation comes after the period of the last sentence. Please see the following sample essay for an example block quote.

Signal Phrase Examples and Ideas

Please see the following sample essay for different kinds of signal phrases and parenthetical in-text citations, which correspond with the sample Works Cited page at the end. The Writing Center also has a handout on signal phrases with many different verb options.

Learn more about the MLA Works Cited page by reviewing this handout .

For information on STLCC's academic integrity policy, check out this website .

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

MLA In-Text Citations: The Basics

Welcome to the Purdue OWL

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Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Guidelines for referring to the works of others in your text using MLA style are covered throughout the  MLA Handbook  and in chapter 7 of the  MLA Style Manual . Both books provide extensive examples, so it's a good idea to consult them if you want to become even more familiar with MLA guidelines or if you have a particular reference question.

Basic in-text citation rules

In MLA Style, referring to the works of others in your text is done using parenthetical citations . This method involves providing relevant source information in parentheses whenever a sentence uses a quotation or paraphrase. Usually, the simplest way to do this is to put all of the source information in parentheses at the end of the sentence (i.e., just before the period). However, as the examples below will illustrate, there are situations where it makes sense to put the parenthetical elsewhere in the sentence, or even to leave information out.

General Guidelines

• The source information required in a parenthetical citation depends (1) upon the source medium (e.g. print, web, DVD) and (2) upon the source’s entry on the Works Cited page.
• Any source information that you provide in-text must correspond to the source information on the Works Cited page. More specifically, whatever signal word or phrase you provide to your readers in the text must be the first thing that appears on the left-hand margin of the corresponding entry on the Works Cited page.

In-text citations: Author-page style

MLA format follows the author-page method of in-text citation. This means that the author's last name and the page number(s) from which the quotation or paraphrase is taken must appear in the text, and a complete reference should appear on your Works Cited page. The author's name may appear either in the sentence itself or in parentheses following the quotation or paraphrase, but the page number(s) should always appear in the parentheses, not in the text of your sentence. For example:

Both citations in the examples above, (263) and (Wordsworth 263), tell readers that the information in the sentence can be located on page 263 of a work by an author named Wordsworth. If readers want more information about this source, they can turn to the Works Cited page, where, under the name of Wordsworth, they would find the following information:

Wordsworth, William. Lyrical Ballads . Oxford UP, 1967.

In-text citations for print sources with known author

For print sources like books, magazines, scholarly journal articles, and newspapers, provide a signal word or phrase (usually the author’s last name) and a page number. If you provide the signal word/phrase in the sentence, you do not need to include it in the parenthetical citation.

These examples must correspond to an entry that begins with Burke, which will be the first thing that appears on the left-hand margin of an entry on the Works Cited page:

Burke, Kenneth. Language as Symbolic Action: Essays on Life, Literature, and Method . University of California Press, 1966.

In-text citations for print sources by a corporate author

When a source has a corporate author, it is acceptable to use the name of the corporation followed by the page number for the in-text citation. You should also use abbreviations (e.g., nat'l for national) where appropriate, so as to avoid interrupting the flow of reading with overly long parenthetical citations.

In-text citations for sources with non-standard labeling systems

If a source uses a labeling or numbering system other than page numbers, such as a script or poetry, precede the citation with said label. When citing a poem, for instance, the parenthetical would begin with the word “line”, and then the line number or range. For example, the examination of William Blake’s poem “The Tyger” would be cited as such:

The speaker makes an ardent call for the exploration of the connection between the violence of nature and the divinity of creation. “In what distant deeps or skies. / Burnt the fire of thine eyes," they ask in reference to the tiger as they attempt to reconcile their intimidation with their relationship to creationism (lines 5-6).

Longer labels, such as chapters (ch.) and scenes (sc.), should be abbreviated.

In-text citations for print sources with no known author

When a source has no known author, use a shortened title of the work instead of an author name, following these guidelines.

Place the title in quotation marks if it's a short work (such as an article) or italicize it if it's a longer work (e.g. plays, books, television shows, entire Web sites) and provide a page number if it is available.

Titles longer than a standard noun phrase should be shortened into a noun phrase by excluding articles. For example, To the Lighthouse would be shortened to Lighthouse .

If the title cannot be easily shortened into a noun phrase, the title should be cut after the first clause, phrase, or punctuation:

In this example, since the reader does not know the author of the article, an abbreviated title appears in the parenthetical citation, and the full title of the article appears first at the left-hand margin of its respective entry on the Works Cited page. Thus, the writer includes the title in quotation marks as the signal phrase in the parenthetical citation in order to lead the reader directly to the source on the Works Cited page. The Works Cited entry appears as follows:

"The Impact of Global Warming in North America." Global Warming: Early Signs . 1999. www.climatehotmap.org/. Accessed 23 Mar. 2009.

If the title of the work begins with a quotation mark, such as a title that refers to another work, that quote or quoted title can be used as the shortened title. The single quotation marks must be included in the parenthetical, rather than the double quotation.

Parenthetical citations and Works Cited pages, used in conjunction, allow readers to know which sources you consulted in writing your essay, so that they can either verify your interpretation of the sources or use them in their own scholarly work.

Author-page citation for classic and literary works with multiple editions

Page numbers are always required, but additional citation information can help literary scholars, who may have a different edition of a classic work, like Marx and Engels's  The Communist Manifesto . In such cases, give the page number of your edition (making sure the edition is listed in your Works Cited page, of course) followed by a semicolon, and then the appropriate abbreviations for volume (vol.), book (bk.), part (pt.), chapter (ch.), section (sec.), or paragraph (par.). For example:

Author-page citation for works in an anthology, periodical, or collection

When you cite a work that appears inside a larger source (for instance, an article in a periodical or an essay in a collection), cite the author of the  internal source (i.e., the article or essay). For example, to cite Albert Einstein's article "A Brief Outline of the Theory of Relativity," which was published in  Nature  in 1921, you might write something like this:

See also our page on documenting periodicals in the Works Cited .

Citing authors with same last names

Sometimes more information is necessary to identify the source from which a quotation is taken. For instance, if two or more authors have the same last name, provide both authors' first initials (or even the authors' full name if different authors share initials) in your citation. For example:

Citing a work by multiple authors

For a source with two authors, list the authors’ last names in the text or in the parenthetical citation:

Corresponding Works Cited entry:

Best, David, and Sharon Marcus. “Surface Reading: An Introduction.” Representations , vol. 108, no. 1, Fall 2009, pp. 1-21. JSTOR, doi:10.1525/rep.2009.108.1.1

For a source with three or more authors, list only the first author’s last name, and replace the additional names with et al.

Franck, Caroline, et al. “Agricultural Subsidies and the American Obesity Epidemic.” American Journal of Preventative Medicine , vol. 45, no. 3, Sept. 2013, pp. 327-333.

Citing multiple works by the same author

If you cite more than one work by an author, include a shortened title for the particular work from which you are quoting to distinguish it from the others. Put short titles of books in italics and short titles of articles in quotation marks.

Citing two articles by the same author :

Citing two books by the same author :

Additionally, if the author's name is not mentioned in the sentence, format your citation with the author's name followed by a comma, followed by a shortened title of the work, and, when appropriate, the page number(s):

Citing multivolume works

If you cite from different volumes of a multivolume work, always include the volume number followed by a colon. Put a space after the colon, then provide the page number(s). (If you only cite from one volume, provide only the page number in parentheses.)

Citing the Bible

In your first parenthetical citation, you want to make clear which Bible you're using (and underline or italicize the title), as each version varies in its translation, followed by book (do not italicize or underline), chapter, and verse. For example:

If future references employ the same edition of the Bible you’re using, list only the book, chapter, and verse in the parenthetical citation:

John of Patmos echoes this passage when describing his vision (Rev. 4.6-8).

Citing indirect sources

Sometimes you may have to use an indirect source. An indirect source is a source cited within another source. For such indirect quotations, use "qtd. in" to indicate the source you actually consulted. For example:

Note that, in most cases, a responsible researcher will attempt to find the original source, rather than citing an indirect source.

Citing transcripts, plays, or screenplays

Sources that take the form of a dialogue involving two or more participants have special guidelines for their quotation and citation. Each line of dialogue should begin with the speaker's name written in all capitals and indented half an inch. A period follows the name (e.g., JAMES.) . After the period, write the dialogue. Each successive line after the first should receive an additional indentation. When another person begins speaking, start a new line with that person's name indented only half an inch. Repeat this pattern each time the speaker changes. You can include stage directions in the quote if they appear in the original source.

Conclude with a parenthetical that explains where to find the excerpt in the source. Usually, the author and title of the source can be given in a signal phrase before quoting the excerpt, so the concluding parenthetical will often just contain location information like page numbers or act/scene indicators.

Here is an example from O'Neill's  The Iceman Cometh.

WILLIE. (Pleadingly) Give me a drink, Rocky. Harry said it was all right. God, I need a drink.

ROCKY. Den grab it. It's right under your nose.

WILLIE. (Avidly) Thanks. (He takes the bottle with both twitching hands and tilts it to his lips and gulps down the whiskey in big swallows.) (1.1)

Citing non-print or sources from the Internet

With more and more scholarly work published on the Internet, you may have to cite sources you found in digital environments. While many sources on the Internet should not be used for scholarly work (reference the OWL's  Evaluating Sources of Information  resource), some Web sources are perfectly acceptable for research. When creating in-text citations for electronic, film, or Internet sources, remember that your citation must reference the source on your Works Cited page.

Sometimes writers are confused with how to craft parenthetical citations for electronic sources because of the absence of page numbers. However, these sorts of entries often do not require a page number in the parenthetical citation. For electronic and Internet sources, follow the following guidelines:

• Include in the text the first item that appears in the Work Cited entry that corresponds to the citation (e.g. author name, article name, website name, film name).
• Do not provide paragraph numbers or page numbers based on your Web browser’s print preview function.
• Unless you must list the Web site name in the signal phrase in order to get the reader to the appropriate entry, do not include URLs in-text. Only provide partial URLs such as when the name of the site includes, for example, a domain name, like  CNN.com  or  Forbes.com,  as opposed to writing out http://www.cnn.com or http://www.forbes.com.

Miscellaneous non-print sources

Two types of non-print sources you may encounter are films and lectures/presentations:

In the two examples above “Herzog” (a film’s director) and “Yates” (a presentor) lead the reader to the first item in each citation’s respective entry on the Works Cited page:

Herzog, Werner, dir. Fitzcarraldo . Perf. Klaus Kinski. Filmverlag der Autoren, 1982.

Yates, Jane. "Invention in Rhetoric and Composition." Gaps Addressed: Future Work in Rhetoric and Composition, CCCC, Palmer House Hilton, 2002. Address.

Electronic sources

Electronic sources may include web pages and online news or magazine articles:

In the first example (an online magazine article), the writer has chosen not to include the author name in-text; however, two entries from the same author appear in the Works Cited. Thus, the writer includes both the author’s last name and the article title in the parenthetical citation in order to lead the reader to the appropriate entry on the Works Cited page (see below).

In the second example (a web page), a parenthetical citation is not necessary because the page does not list an author, and the title of the article, “MLA Formatting and Style Guide,” is used as a signal phrase within the sentence. If the title of the article was not named in the sentence, an abbreviated version would appear in a parenthetical citation at the end of the sentence. Both corresponding Works Cited entries are as follows:

Taylor, Rumsey. "Fitzcarraldo." Slant , 13 Jun. 2003, www.slantmagazine.com/film/review/fitzcarraldo/. Accessed 29 Sep. 2009. 

"MLA Formatting and Style Guide." The Purdue OWL , 2 Aug. 2016, owl.english.purdue.edu/owl/resource/747/01/. Accessed 2 April 2018.

Multiple citations

To cite multiple sources in the same parenthetical reference, separate the citations by a semi-colon:

Time-based media sources

When creating in-text citations for media that has a runtime, such as a movie or podcast, include the range of hours, minutes and seconds you plan to reference. For example: (00:02:15-00:02:35).

When a citation is not needed

Common sense and ethics should determine your need for documenting sources. You do not need to give sources for familiar proverbs, well-known quotations, or common knowledge (For example, it is expected that U.S. citizens know that George Washington was the first President.). Remember that citing sources is a rhetorical task, and, as such, can vary based on your audience. If you’re writing for an expert audience of a scholarly journal, for example, you may need to deal with expectations of what constitutes “common knowledge” that differ from common norms.

Other Sources

The MLA Handbook describes how to cite many different kinds of authors and content creators. However, you may occasionally encounter a source or author category that the handbook does not describe, making the best way to proceed can be unclear.

In these cases, it's typically acceptable to apply the general principles of MLA citation to the new kind of source in a way that's consistent and sensible. A good way to do this is to simply use the standard MLA directions for a type of source that resembles the source you want to cite.

You may also want to investigate whether a third-party organization has provided directions for how to cite this kind of source. For example, Norquest College provides guidelines for citing Indigenous Elders and Knowledge Keepers⁠ —an author category that does not appear in the MLA Handbook . In cases like this, however, it's a good idea to ask your instructor or supervisor whether using third-party citation guidelines might present problems.

Home / Guides / Citation Guides / MLA Format / How to Cite an Essay in MLA

How to Cite an Essay in MLA

The guidelines for citing an essay in MLA format are similar to those for citing a chapter in a book. Include the author of the essay, the title of the essay, the name of the collection if the essay belongs to one, the editor of the collection or other contributors, the publication information, and the page number(s).

Citing an Essay

Mla essay citation structure.

Last, First M. “Essay Title.” Collection Title, edited by First M. Last, Publisher, year published, page numbers. Website Title , URL (if applicable).

MLA Essay Citation Example

Gupta, Sanjay. “Balancing and Checking.” Essays on Modern Democracy, edited by Bob Towsky, Brook Stone Publishers, 1996, pp. 36-48. Essay Database, www . databaseforessays.org/modern/modern-democracy.

MLA Essay In-text Citation Structure

(Last Name Page #)

MLA Essay In-text Citation Example

Click here to cite an essay via an EasyBib citation form.

MLA Formatting Guide

MLA Formatting

• Annotated Bibliography
• Bibliography
• Block Quotes
• et al Usage
• In-text Citations
• Paraphrasing
• Page Numbers
• Sample Paper
• Works Cited
• MLA 8 Updates
• MLA 9 Updates
• View MLA Guide

Citation Examples

• Book Chapter
• Journal Article
• Magazine Article
• Newspaper Article
• Website (no author)
• View all MLA Examples

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To cite your sources in an essay in MLA style, you need to have basic information including the author’s name(s), chapter title, book title, editor(s), publication year, publisher, and page numbers. The templates for in-text citations and a works-cited-list entry for essay sources and some examples are given below:

In-text citation template and example:

For citations in prose, use the first name and surname of the author on the first occurrence. For subsequent citations, use only the surname(s). In parenthetical citations, always use only the surname of the author(s).

Citation in prose:

First mention: Annette Wheeler Cafarelli

Subsequent occurrences: Wheeler Cafarelli

Parenthetical:

….(Wheeler Cafarelli).

Works-cited-list entry template and example:

The title of the chapter is enclosed in double quotation marks and uses title case. The book or collection title is given in italics and uses title case.

Surname, First Name. “Title of the Chapter.” Title of the Book , edited by Editor(s) Name, Publisher, Publication Year, page range.

Cafarelli, Annette Wheeler. “Rousseau and British Romanticism: Women and British Romanticism.” Cultural Interactions in the Romantic Age: Critical Essays in Comparative Literature , edited by Gregory Maertz. State U of New York P, 1998, pp. 125–56.

To cite an essay in MLA style, you need to have basic information including the author(s), the essay title, the book title, editor(s), publication year, publisher, and page numbers. The templates for citations in prose, parenthetical citations, and works-cited-list entries for an essay by multiple authors, and some examples, are given below:

For citations in prose, use the first name and surname of the author (e.g., Mary Strine).

For sources with two authors, use both full author names in prose (e.g., Mary Strine and Beth Radick).

For sources with three or more authors, use the first name and surname of the first author followed by “and others” or “and colleagues” (e.g., Mary Strine and others). In subsequent citations, use only the surname of the first author followed by “and others” or “and colleagues” (e.g., Strine and others).

In parenthetical citations, use only the author’s surname. For sources with two authors, use two surnames (e.g., Strine and Radick). For sources with three or more author names, use the first author’s surname followed by “et al.”

First mention: Mary Strine…

Subsequent mention: Strine…

First mention: Mary Strine and Beth Radick…

Subsequent mention: Strine and Radick…

First mention: Mary Strine and colleagues …. or Mary Strine and others

Subsequent occurrences: Strine and colleagues …. or Strine and others

…. (Strine).

….(Strine and Radick).

….(Strine et al.).

The title of the essay is enclosed in double quotation marks and uses title case. The book or collection title is given in italics and uses title case.

Surname, First Name, et al. “Title of the Essay.” Title of the Book , edited by Editor(s) Name, Publisher, Publication Year, page range.

Strine, Mary M., et al. “Research in Interpretation and Performance Studies: Trends, Issues, Priorities.” Speech Communication: Essays to Commemorate the 75th Anniversary of the Speech Communication Association , edited by Gerald M. Phillips and Julia T. Wood, Southern Illinois UP, 1990, pp. 181–204.

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Traffic engineers build roads that invite crashes because they rely on outdated research and faulty data

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“Can you name the truck with four-wheel drive, smells like a steak, and seats 35?”

Back in 1998, “The Simpsons” joked about the Canyonero, an SUV so big that they were obviously kidding. At that time, it was preposterous to think anyone would drive something that was “12 yards long, two lanes wide, 65 tons of American Pride.”

In 2024, that joke isn’t far from reality.

And our reality is one where more pedestrians and bicyclists are getting killed on U.S. streets than at any time in the past 45 years – over 1,000 bicyclists and 7,500 pedestrians in 2022 alone.

Vehicle size is a big part of this problem. A recent paper by urban economist Justin Tyndall found that increasing the front-end height of a vehicle by roughly 4 inches (10 centimeters) increases the chance of a pedestrian fatality by 22% . The risk increases by 31% for female pedestrians or those over 65 years, and by 81% for children.

It’s hard to argue with physics, so there is a certain logic in blaming cars for rising traffic deaths. In fact, if a bicyclist is hit by a pickup truck instead of a car, Tyndall suggests that they are 291% more likely to die.

Yet automakers have long asserted that if everyone simply followed the rules of the road, nobody would die. Vehicle size is irrelevant to that assertion.

My discipline, traffic engineering , acts similarly. We underestimate our role in perpetuating bad outcomes, as well as the role that better engineering can play in designing safer communities and streets.

Millions of road deaths

How bad are the bad outcomes? The U.S. has been tracking car-related road deaths since 1899. As a country, we hit the threshold of 1 million cumulative deaths in 1953, 2 million in 1975 and 3 million in 1998. While the past several years of data have not yet been released, I estimate that the U.S. topped 4 million total road deaths sometime in the spring of 2024.

How many of those are pedestrians and bicyclists? Analysts didn’t do a great job of separating out the pedestrian and cyclist deaths in the early years , but based on later trends, my estimate is that some 930,000 pedestrians and bicyclists have been killed by automobiles in the U.S.

How many of those deaths do we blame on big cars or bad streets? The answer is, very few.

As I show in my new book, “ Killed by a Traffic Engineer: Shattering the Delusion that Science Underlies our Transportation System ,” the National Highway Traffic Safety Administration calls road user error the “ critical reason” behind 94% of crashes, injuries and deaths .

Crash data backs that up.

Police investigate crashes and inevitably look to see which road users, including drivers, pedestrians and cyclists, are most at fault. It’s easy to do because in almost any crash, road user error appears to be the obvious problem.

This approach helps insurance companies figure out who needs to pay. It also helps automakers and traffic engineers rationalize away all these deaths. Everyone – except the families and friends of these 4 million victims – goes to sleep at night feeling good that bad-behaving road users just need more education or better enforcement.

But road user error only scratches the surface of the problem.

Who creates dangerous streets?

When traffic engineers build an overly wide street that looks more like a freeway , and a speeding driver in a Canyonero crashes, subsequent crash data blames the driver for speeding.

When traffic engineers provide lousy crosswalks separated by long distances , and someone jaywalks and gets hit by that speeding Canyonero driver, one or both of these road users will be blamed in the official crash report.

And when automakers build gargantuan vehicles that can easily go double the speed limit and fill them with distracting touchscreens , crash data will still blame the road users for almost anything bad that happens.

These are the sorts of systemic conditions that lead to many so-called road user errors. Look just below the surface, though, and it becomes clear that many human errors represent the typical, rational behaviors of typical, rational road users given the transportation system and vehicle options we put in front of them.

Look more deeply, and you can start to see how our underlying crash data gives everyone a pass but the road users themselves. Everyone wants a data-driven approach to road safety, but today’s standard view of crash data lets automakers, insurance companies and policymakers who shape vehicle safety standards off the hook for embiggening these ever-larger cars and light-duty trucks.

It also absolves traffic engineers, planners and policymakers of blame for creating a transportation system where for most Americans, the only rational choice for getting around is a car .

Understanding road behavior

Automakers want to sell cars and make money. And if bigger SUVs seem safer to potential customers, while also being much more profitable , it’s easy to see how interactions between road users and car companies – making seemingly rational decisions – have devolved into an SUV arms race.

Even though these same vehicles are less safe for pedestrians, bicyclists and those in opposing vehicles , the current data-driven approach to road safety misses that part of the story.

This can’t all be fixed at once. But by pursuing business as usual, automakers and traffic engineers will continue wasting money on victim-blaming campaigns or billboards placed high over a road telling drivers to pay attention to the road .

A better starting point would be remaking the U.S.’s allegedly data-driven approach to road safety by reinventing our understanding of the crash data that informs it all.

The key is starting to ask why. Why did these road users act as they did? Why didn’t they follow the rules that were laid out for them? Bad road user behavior shouldn’t be excused, but a bit of digging below the surface of crash data unearths a completely different story.

Figuring out which road user is most at fault may be useful for law enforcement and insurance companies, but it doesn’t give transportation engineers, planners, policymakers or automakers much insight into what they can do better. Even worse, it has kept them from realizing that they might be doing anything wrong.

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• Sustainable cities
• Transportation policy
• Safe streets
• Bicycle safety
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• How to Cite a Book | APA, MLA, & Chicago Examples

How to Cite a Book | APA, MLA, & Chicago Examples

Published on February 26, 2021 by Jack Caulfield . Revised on January 17, 2024.

To cite a book, you need a brief in-text citation and a corresponding reference listing the author’s name, the title, the year of publication, and the publisher. The order and format of information depends on the citation style you’re using. The most common styles are APA , MLA , and Chicago style .

Use the interactive example generator to explore the format of book citations in MLA and APA.

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Table of contents

Citing a book in mla style, citing a book in apa style, citing a book in chicago style, where to find source information in a book, frequently asked questions about citations.

An MLA book citation includes the author’s name , the book title (in italics, capitalized headline-style), the edition (if specified), the publisher, and the year of publication. If it’s an e-book , write “e-book” (or a more specific description, e.g. “Kindle ed.”) before the publisher name.

The corresponding in-text citation lists the author’s last name and the page number of the passage cited.

You can also use our free MLA Citation Generator to create your book citations.

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Citing a book chapter in mla.

To cite a book chapter , first give the author and title (in quotation marks) of the chapter cited, then information about the book as a whole and the page range of the specific chapter.

The in-text citation lists the author of the chapter and the page number of the relevant passage.

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An APA Style book citation lists the author’s last name and initials, the year of publication, the title and any subtitle (in italics, capitalizing only the first word), the edition (if specified), and the publisher. Add a DOI or URL to the end of the entry if available (e.g. for e-books or books accessed online ).

In an in-text citation, state the author’s last name and the publication year, and a page number if you need to show the location of a specific quote or paraphrase .

You can also use our free APA Citation Generator to automatically generate your book citations. Search for a title, DOI, or ISBN to retrieve the details.

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Citing a book chapter in apa.

To cite a book chapter , list information about the chapter first, followed by information about the book, including the book’s editor(s) and the chapter’s page range within the book.

The author of the chapter, not the editor of the book, is listed in the in-text citation.

Chicago notes and bibliography style uses footnotes to cite sources instead of parenthetical citations. These notes refer to a bibliography at the end giving full source details.

A Chicago bibliography entry for a book includes the author’s name, the book title and subtitle, the edition (if stated), the location and name of the publisher, and the year of publication. For an e-book , add the e-book format (e.g. “Kindle”) at the end.

Chicago also has an alternative style, Chicago author-date . You can see examples of book citations in this style here .

Citing a book chapter in Chicago

To cite a book chapter , start with the author and the title of the chapter (in quotation marks), then give the title (in italics) and editor of the book, the page range of the chapter, the location and name of the publisher, and the year of publication.

All the information you need for a book citation can usually be found on the book’s title page and copyright page. The main things you’re looking for are:

• the title (and subtitle if present)
• name(s) of the author(s)
• year of publication
• place of publication

You should also check if the book specifies an edition (e.g. 2nd edition, revised edition) and if any other contributors are named (e.g. editor, translator).

The image below shows where to find the relevant information on the title and copyright pages of a typical book.

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The main elements included in all book citations across APA , MLA , and Chicago style are the author, the title, the year of publication, and the name of the publisher. A page number is also included in in-text citations to highlight the specific passage cited.

In Chicago style and in the 6th edition of APA Style , the location of the publisher is also included, e.g. London: Penguin.

When a book’s chapters are written by different authors, you should cite the specific chapter you are referring to.

When all the chapters are written by the same author (or group of authors), you should usually cite the entire book, but some styles include exceptions to this.

• In APA Style , single-author books should always be cited as a whole, even if you only quote or paraphrase from one chapter.
• In MLA Style , if a single-author book is a collection of stand-alone works (e.g. short stories ), you should cite the individual work.
• In Chicago Style , you may choose to cite a single chapter of a single-author book if you feel it is more appropriate than citing the whole book.

Check if your university or course guidelines specify which citation style to use. If the choice is left up to you, consider which style is most commonly used in your field.

• APA Style is the most popular citation style, widely used in the social and behavioral sciences.
• MLA style is the second most popular, used mainly in the humanities.
• Chicago notes and bibliography style is also popular in the humanities, especially history.
• Chicago author-date style tends to be used in the sciences.

Other more specialized styles exist for certain fields, such as Bluebook and OSCOLA for law.

The most important thing is to choose one style and use it consistently throughout your text.

The abbreviation “ et al. ” (Latin for “and others”) is used to shorten citations of sources with multiple authors.

“Et al.” is used in APA in-text citations of sources with 3+ authors, e.g. (Smith et al., 2019). It is not used in APA reference entries .

Use “et al.” for 3+ authors in MLA in-text citations and Works Cited entries.

Use “et al.” for 4+ authors in a Chicago in-text citation , and for 10+ authors in a Chicago bibliography entry.

When you want to cite a specific passage in a source without page numbers (e.g. an e-book or website ), all the main citation styles recommend using an alternate locator in your in-text citation . You might use a heading or chapter number, e.g. (Smith, 2016, ch. 1)

In APA Style , you can count the paragraph numbers in a text to identify a location by paragraph number. MLA and Chicago recommend that you only use paragraph numbers if they’re explicitly marked in the text.

For audiovisual sources (e.g. videos ), all styles recommend using a timestamp to show a specific point in the video when relevant.

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the “Cite this Scribbr article” button to automatically add the citation to our free Citation Generator.

Caulfield, J. (2024, January 17). How to Cite a Book | APA, MLA, & Chicago Examples. Scribbr. Retrieved June 24, 2024, from https://www.scribbr.com/citing-sources/cite-a-book/

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Title: empirical bayes for dynamic bayesian networks using generalized variational inference.

Abstract: In this work, we demonstrate the Empirical Bayes approach to learning a Dynamic Bayesian Network. By starting with several point estimates of structure and weights, we can use a data-driven prior to subsequently obtain a model to quantify uncertainty. This approach uses a recent development of Generalized Variational Inference, and indicates the potential of sampling the uncertainty of a mixture of DAG structures as well as a parameter posterior.

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