Common Citations and References in APA Style (7th Ed.)

The American Psychological Association (APA) established writing and documentation guidelines in 1929, so readers could easily understand the major points and findings in scientific research. Today, APA Style is used across the disciplines as a standard style for academic and professional writing. APA Style helps writers think critically, communicate clearly and precisely, and document sources ethically. This tutorial on APA citations and references follows the guidelines of the Publication Manual of the American Psychological Association seventh edition.

Citations and references are forms of documentation. We must document the ideas, theories, definitions, data, images, and other information in our writing that originated with other authors, researchers, and artists. For example, our work must include documentation when we quote, paraphrase, or summarize another’s ideas or when using data from others’ research. Documentation means including select information about a source “in text” and including additional bibliographic information about that source in a “reference list entry.” In APA Style, for every retrievable source cited in text, there is a corresponding reference list entry with that retrieval information.

Documentation is how we establish our credibility as researchers and writers. It is how we write ethically and with integrity. Writing often involves using the ideas, theories, definitions, data, and images of others in order to support or refute our theses. Documentation is how we give credit to others for their contributions to our work. Documenting sources also differentiates our original ideas from the source contributions and enables readers to locate the original source to learn more about it. Documenting sources with in-text citations and reference list entries also prevents plagiarism, which “is the act of presenting the words, ideas, or images of another as your own” (APA, 2020, p. 254).

APA Style in-text citations use the author-date system. In this APA Style in-text citations use the author-date system. In this system, the citation identifies a source used in the “text” (the body of a piece of writing) by providing the source’s author and the date of publication. Additional rules apply for in-text citations for varying source types and paraphrasing, but there are two primary types of in-text citations: narrative and parenthetical.

In narrative citations, the author’s name is part of a sentence and usually appears in a signal phrase that introduces the quoted, paraphrased, or summarized information. The second part of the citation, the publication year, then appears in parentheses immediately following the author’s name. Here is an example:

• Smith (2010) recognized that more online learning opportunities are needed to reach marginalized high school students and decrease the dropout rate.

When citing a quotation using a narrative citation, the author’s name is used in the sentence, the date is given in parentheses after the author’s name, and the specific part of the source where the quote appears such the page, paragraph, time stamp on a video, or bar on a graph goes in parentheses after the quote and before any punctuation. Here are two examples:

• Smith (2010) stressed, “The importance of dedicated study time for online courses is crucial for student success” (p. 3).
• In his TEDX Talk video, Mulvey (2013) said, “Time is too long. Space is too large” (6:18).

In parenthetical citations, the author-date information goes after the paraphrase in parentheses as in the following example:

• Online learning opportunities are needed to reach marginalized high school students and decrease the dropout rate (Smith, 2010).

For a quotation, the parenthetical citation contains the author and date, and it also contains the specific part of the source such as the page or paragraph number or the timestamp of a video as in this example:

• Many researchers have agreed: “Online education is a viable way to help working adults earn a college degree, but it is not for everyone” (Smith, 2010, p. 4).

An author may be an individual, multiple people, or a group such as an organization, company, or governmental agency. In an in-text citation, the format is to use the author or authors’ last names or the group author name. See No Author if a source does not specify an author.

• Individual Author: (Hannah, 2010)
• Multiple Authors: (Hannah & Lay, 2015); (Hannah, Lay, & Sleder, 2010)
• Group Author: (Hannah and Lay Company, 2020)

The URL, which stands for Uniform Resource Locator and is the web address for a source is not part of an in-text citation except in the rare cases that the URL is also the author’s name such as Drugs.com: (Drugs.com, n.d.).

The in-text citation for a quotation includes the part of the source where the information is found. Page numbers are common in printed books and articles; however, for electronic sources without page numbers, you will need to provide another way for a reader to locate the original passage being quoted. The following options are acceptable:

• Paragraph number: (Mackenzie, 2018, para. 1)
• Heading or section name: (Mackenzie, 2018, Highlands section). In this example, the information being cited can be found on the source website or page under a section named “Highlands.”
• Both section and paragraph: (Mackenzie, 2018, Highlands section, para. 1)
• For audiovisual works, provide the time stamp of when the quoted words begin: (Mulvey, 2013, 6:18).

A reference list entry should be provided for each source cited in text. Reference list entries have four elements: author, date, title, and source. The “source” here is the publication where the information was published such as a website, book, or periodical. Each element of the reference answers a question:

• Author: Who is responsible for this work?
• Date: When was this work published?
• Title: What is this work called?
• Source: Where can I retrieve this work?

Reference entries and in-text citations correspond: The author or title given in the in-text citation is the first element of the reference entry. Example reference entries are provided in the Common Citations and References section of this resource. The following formatting requirements apply to the reference list:

• Label the reference list References in bold font, centered at the top of the page.
• Double-space all reference list entries. Also use double spacing within entries. Do not use additional spacing between entries.
• Reference entries are not numbered or bulleted.
• Use a hanging indent for all references, so the first line of the entry is against the left margin and subsequent lines of the entry are indented 0.5 in.
• Alphabetize the entries according to the author’s last name. If the entry does not include an author, begin the entry with the title followed by the year in parentheses, and alphabetize according to the first significant word of the title. If the title begins with the words “A,” “An,” or “The,” alphabetize using the next word in the title. Example: The title The Whales in the Ocean would be alphabetized using the letter “W” because “Whales” is the first significant word.

Resources available online have URLs, which are web links, or DOIs, which are unique strings of numbers that provide persistent and reliable links to resources. Here are some basic guidelines for URLs and DOIs in reference entries:

• If a source has a DOI, include it in the reference entry. Some print texts also have DOIs. The DOI is often given near the copyright information at the beginning of a text.
• Present DOIs and URLs as hyperlinks in the reference entry. Hyperlinks begin http:// or https://. DOIs will begin https://doi.org/. It is acceptable to use the shortDOI® Service to shorten long DOIs and an URL shortening service such as https://bitly.com/ to shorten URLs.
• All hyperlinks should be live and may appear using the automatic formatting of the word processing program (for example in blue font and underlined), or they may appear in standard black font without an underline, but papers read online should have clickable, live links.
• Do not include additional words before the hyperlink such as “Retrieved from” or “DOI.”
  Exception: If a characteristics of the source is that it is updated regularly, such a reference book with a group author (dictionary, encyclopedia, thesaurus) or a Facebook page, a retrieval date would provide valuable information to a reader who tries to locate your source and sees different content. In the reference, include the date you accessed the source in the following format for the URL element of the reference: Retrieved Month day, Year, from URL.

Common Citations and References (APA 7th Ed.)

Note: Most of the examples in this resource are fictional. Any similarities to real sources or names are coincidental.