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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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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

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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

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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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Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

MLA Formatting and Style Guide

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.

The following overview should help you better understand how to cite sources using MLA 9 th edition, including how to format the Works Cited page and in-text citations.

Please use the example at the bottom of this page to cite the Purdue OWL in MLA. See also our MLA vidcast series on the Purdue OWL YouTube Channel .

Creating a Works Cited list using the ninth edition

MLA is a style of documentation that may be applied to many different types of writing. Since texts have become increasingly digital, and the same document may often be found in several different sources, following a set of rigid rules no longer suffices.

Thus, the current system is based on a few guiding principles, rather than an extensive list of specific rules. While the handbook still describes how to cite sources, it is organized according to the process of documentation, rather than by the sources themselves. This gives writers a flexible method that is near-universally applicable.

Once you are familiar with the method, you can use it to document any type of source, for any type of paper, in any field.

Here is an overview of the process:

When deciding how to cite your source, start by consulting the list of core elements. These are the general pieces of information that MLA suggests including in each Works Cited entry. In your citation, the elements should be listed in the following order:

Title of source.
Title of container,
Other contributors,
Publication date,

Each element should be followed by the corresponding punctuation mark shown above. Earlier editions of the handbook included the place of publication and required different punctuation (such as journal editions in parentheses and colons after issue numbers) depending on the type of source. In the current version, punctuation is simpler (only commas and periods separate the elements), and information about the source is kept to the basics.

Begin the entry with the author’s last name, followed by a comma and the rest of the name, as presented in the work. End this element with a period.

Bhabha, Homi K. The Location of Culture. Routledge, 1994.

Title of source

The title of the source should follow the author’s name. Depending upon the type of source, it should be listed in italics or quotation marks.

A book should be in italics:

Henley, Patricia. The Hummingbird House . MacMurray, 1999.

An individual webpage should be in quotation marks. The name of the parent website, which MLA treats as a "container," should follow in italics:

Lundman, Susan. "How to Make Vegetarian Chili." eHow, www.ehow.com/how_10727_make-vegetarian-chili.html.*

A periodical (journal, magazine, newspaper) article should be in quotation marks:

Bagchi, Alaknanda. "Conflicting Nationalisms: The Voice of the Subaltern in Mahasweta Devi's Bashai Tudu." Tulsa Studies in Women's Literature , vol. 15, no. 1, 1996, pp. 41-50.

A song or piece of music on an album should be in quotation marks. The name of the album should then follow in italics:

Beyoncé. "Pray You Catch Me." Lemonade, Parkwood Entertainment, 2016, www.beyonce.com/album/lemonade-visual-album/.

*The MLA handbook recommends including URLs when citing online sources. For more information, see the “Optional Elements” section below.

Title of container

The eighth edition of the MLA handbook introduced what are referred to as "containers," which are the larger wholes in which the source is located. For example, if you want to cite a poem that is listed in a collection of poems, the individual poem is the source, while the larger collection is the container. The title of the container is usually italicized and followed by a comma, since the information that follows next describes the container.

Kincaid, Jamaica. "Girl." The Vintage Book of Contemporary American Short Stories, edited by Tobias Wolff, Vintage, 1994, pp. 306-07.

The container may also be a television series, which is made up of episodes.

“94 Meetings.” Parks and Recreation, created by Greg Daniels and Michael Schur, performance by Amy Poehler, season 2, episode 21, Deedle-Dee Productions and Universal Media Studios, 2010.

The container may also be a website, which contains articles, postings, and other works.

Wise, DeWanda. “Why TV Shows Make Me Feel Less Alone.” NAMI, 31 May 2019, www.nami.org/Blogs/NAMI-Blog/May-2019/How-TV-Shows-Make-Me-Feel-Less-Alone . Accessed 3 June 2019.

In some cases, a container might be within a larger container. You might have read a book of short stories on Google Books , or watched a television series on Netflix . You might have found the electronic version of a journal on JSTOR. It is important to cite these containers within containers so that your readers can find the exact source that you used.

“94 Meetings.” Parks and Recreation , season 2, episode 21, NBC , 29 Apr. 2010. Netflix, www.netflix.com/watch/70152031?trackId=200256157&tctx=0%2C20%2C0974d361-27cd-44de-9c2a-2d9d868b9f64-12120962.

Langhamer, Claire. “Love and Courtship in Mid-Twentieth-Century England.” Historical Journal , vol. 50, no. 1, 2007, pp. 173-96. ProQuest, doi:10.1017/S0018246X06005966. Accessed 27 May 2009.

Other contributors

In addition to the author, there may be other contributors to the source who should be credited, such as editors, illustrators, translators, etc. If their contributions are relevant to your research, or necessary to identify the source, include their names in your documentation.

Foucault, Michel. Madness and Civilization: A History of Insanity in the Age of Reason. Translated by Richard Howard , Vintage-Random House, 1988.

Woolf, Virginia. Jacob’s Room . Annotated and with an introduction by Vara Neverow, Harcourt, Inc., 2008.

If a source is listed as an edition or version of a work, include it in your citation.

The Bible . Authorized King James Version, Oxford UP, 1998.

Crowley, Sharon, and Debra Hawhee. Ancient Rhetorics for Contemporary Students. 3rd ed., Pearson, 2004.

If a source is part of a numbered sequence, such as a multi-volume book or journal with both volume and issue numbers, those numbers must be listed in your citation.

Dolby, Nadine. “Research in Youth Culture and Policy: Current Conditions and Future Directions.” Social Work and Society: The International Online-Only Journal, vol. 6, no. 2, 2008, www.socwork.net/sws/article/view/60/362. Accessed 20 May 2009.

Quintilian. Institutio Oratoria. Translated by H. E. Butler, vol. 2, Loeb-Harvard UP, 1980.

The publisher produces or distributes the source to the public. If there is more than one publisher, and they are all are relevant to your research, list them in your citation, separated by a forward slash (/).

Klee, Paul. Twittering Machine. 1922. Museum of Modern Art, New York. The Artchive, www.artchive.com/artchive/K/klee/twittering_machine.jpg.html. Accessed May 2006.

Women's Health: Problems of the Digestive System . American College of Obstetricians and Gynecologists, 2006.

Daniels, Greg and Michael Schur, creators. Parks and Recreation . Deedle-Dee Productions and Universal Media Studios, 2015.

Note : The publisher’s name need not be included in the following sources: periodicals, works published by their author or editor, websites whose titles are the same name as their publisher, websites that make works available but do not actually publish them (such as YouTube , WordPress , or JSTOR ).

Publication date

The same source may have been published on more than one date, such as an online version of an original source. For example, a television series might have aired on a broadcast network on one date, but released on Netflix on a different date. When the source has more than one date, it is sufficient to use the date that is most relevant to your writing. If you’re unsure about which date to use, go with the date of the source’s original publication.

In the following example, Mutant Enemy is the primary production company, and “Hush” was released in 1999. Below is a general citation for this television episode:

“Hush.” Buffy the Vampire Slayer , created by Joss Whedon, performance by Sarah Michelle Gellar, season 4, Mutant Enemy, 1999 .

However, if you are discussing, for example, the historical context in which the episode originally aired, you should cite the full date. Because you are specifying the date of airing, you would then use WB Television Network (rather than Mutant Enemy), because it was the network (rather than the production company) that aired the episode on the date you’re citing.

“Hush.” Buffy the Vampire Slayer, created by Joss Whedon, performance by Sarah Michelle Gellar, season 4, episode 10, WB Television Network, 14 Dec. 1999 .

You should be as specific as possible in identifying a work’s location.

An essay in a book or an article in a journal should include page numbers.

Adiche, Chimamanda Ngozi. “On Monday of Last Week.” The Thing around Your Neck, Alfred A. Knopf, 2009, pp. 74-94 .

The location of an online work should include a URL. Remove any "http://" or "https://" tag from the beginning of the URL.

Wheelis, Mark. "Investigating Disease Outbreaks Under a Protocol to the Biological and Toxin Weapons Convention." Emerging Infectious Diseases , vol. 6, no. 6, 2000, pp. 595-600, wwwnc.cdc.gov/eid/article/6/6/00-0607_article. Accessed 8 Feb. 2009.

When citing a physical object that you experienced firsthand, identify the place of location.

Matisse, Henri. The Swimming Pool. 1952, Museum of Modern Art, New York .

Optional elements

The ninth edition is designed to be as streamlined as possible. The author should include any information that helps readers easily identify the source, without including unnecessary information that may be distracting. The following is a list of optional elements that can be included in a documented source at the writer’s discretion.

Date of original publication:

If a source has been published on more than one date, the writer may want to include both dates if it will provide the reader with necessary or helpful information.

Erdrich, Louise. Love Medicine. 1984. Perennial-Harper, 1993.

City of publication:

The seventh edition handbook required the city in which a publisher is located, but the eighth edition states that this is only necessary in particular instances, such as in a work published before 1900. Since pre-1900 works were usually associated with the city in which they were published, your documentation may substitute the city name for the publisher’s name.

Thoreau, Henry David. Excursions . Boston, 1863.

Date of access:

When you cite an online source, the MLA Handbook recommends including a date of access on which you accessed the material, since an online work may change or move at any time.

Bernstein, Mark. "10 Tips on Writing the Living Web." A List Apart: For People Who Make Websites, 16 Aug. 2002, alistapart.com/article/writeliving. Accessed 4 May 2009.

As mentioned above, while the MLA handbook recommends including URLs when you cite online sources, you should always check with your instructor or editor and include URLs at their discretion.

A DOI, or digital object identifier, is a series of digits and letters that leads to the location of an online source. Articles in journals are often assigned DOIs to ensure that the source is locatable, even if the URL changes. If your source is listed with a DOI, use that instead of a URL.

Alonso, Alvaro, and Julio A. Camargo. "Toxicity of Nitrite to Three Species of Freshwater Invertebrates." Environmental Toxicology , vol. 21, no. 1, 3 Feb. 2006, pp. 90-94. Wiley Online Library, doi: 10.1002/tox.20155.

Creating in-text citations using the previous (eighth) edition

Although the MLA handbook is currently in its ninth edition, some information about citing in the text using the older (eighth) edition is being retained. The in-text citation is a brief reference within your text that indicates the source you consulted. It should properly attribute any ideas, paraphrases, or direct quotations to your source, and should direct readers to the entry in the Works Cited list. For the most part, an in-text citation is the author’s name and the page number (or just the page number, if the author is named in the sentence) in parentheses :

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).

Again, your goal is to attribute your source and provide a reference without interrupting your text. Your readers should be able to follow the flow of your argument without becoming distracted by extra information.

How to Cite the Purdue OWL in MLA

Entire Website

The Purdue OWL . Purdue U Writing Lab, 2019.

Individual Resources

Contributors' names. "Title of Resource." The Purdue OWL , Purdue U Writing Lab, Last edited date.

The new OWL no longer lists most pages' authors or publication dates. Thus, in most cases, citations will begin with the title of the resource, rather than the developer's name.

"MLA Formatting and Style Guide." The Purdue OWL, Purdue U Writing Lab. Accessed 18 Jun. 2018.