APA Style Citation Guide

The paper that taught me to stop trusting citation generators was a research proposal on sleep and memory. The student had run every source through a free online tool, pasted the results into her References list, and handed it in feeling safe. Half the entries had “Retrieved from” in front of the links, three still used the old doi: prefix, and two journal articles had lost their issue numbers. None of it was catastrophic. All of it told the reader that nobody had looked at the list. That is the real cost of sloppy APA: not the lost points, but the signal.

So this guide is the way I teach APA to students who have never opened the manual and never plan to. I will show you what the style is for, how a paper is laid out, how the two halves of a citation fit together, and how to build the three kinds of entries you will use most. Everything follows the seventh edition of the Publication Manual, and I will say where student papers differ from professional ones.

What APA Style is, and who actually uses it

APA stands for the American Psychological Association, and the style began as rules for its own journals. The current authority is the Publication Manual of the American Psychological Association, Seventh Edition, published in 2020. Several rules changed from the sixth edition, so a handout from 2015 is now a liability.

Psychology is the obvious home, but APA reaches much further. The manual itself lists the social and behavioral sciences, nursing, education, communications, business, and even engineering among its users. If your course sits anywhere near the study of people (how they learn, behave, heal, or organize themselves), you will probably be asked for APA at some point.

The logic behind the style explains most of its rules. APA is an author and date system: when you cite a source, the reader sees who wrote it and when. In fields where knowledge moves quickly, the year matters almost as much as the name. A finding from 2003 and a finding from 2023 are different claims, and the citation says which one you are leaning on without a trip to the back of the paper.

The two halves of every APA citation

Every source you use in an APA paper appears twice. Once in the text, briefly, as an in-text citation. Once at the end, fully, as an entry in the References list. Think of them as a lock and key: the short citation in the text has to open exactly one entry in the list, and every entry has to be opened at least once.

	In-text citation	References entry
Where	Inside your paragraphs	On its own page at the end
What it shows	Author surname and year	Author, date, title, source
Job	Point the reader to one entry	Let the reader find the source
Example	(Luna, 2020)	Luna, A. B. (2020). Title of the work. Publisher.

Most APA errors I mark are mismatches between the two halves. The text says (Chen & Okafor, 2019) and the list has the article dated 2018. The text cites a source that never made it to the list. The list carries a book cut from the draft two weeks ago. These are bookkeeping problems, not formatting problems, and the cure is a habit: whenever you add or remove a citation in the text, go to the References list in the same sitting.

If you have written in MLA before, the shift is mainly in what the parentheses carry. MLA points to a page; APA points to a year. I walk through that system in the MLA format and citation guide, and reading the two side by side is the quickest way to stop mixing them.

Setting up the paper: title page, page numbers, headings

The seventh edition gives you two versions of the title page, one for student papers and one for professional manuscripts. Use the student version unless your instructor says otherwise.

A student title page carries the paper title, your name, your department and institution, the course number and name, the instructor’s name, the due date, and a page number. The title sits three or four lines down, centered, in bold, with major words capitalized. Everything else follows on its own double-spaced centered line. The page number goes in the top right corner of the header, and the title page is page 1.

Here is the rule that trips up almost everyone who learned APA before 2020: student papers do not include a running head unless the instructor or institution requests one. The running head, that short capitalized version of your title in the header, is still required for professional papers going to journals, where it appears on every page without the label “Running head:” in front of it. For a class paper, leave it off unless you are told to add it.

Headings come in five levels, used in order, never skipping. Level 1 is centered, bold, title case. Level 2 is flush left, bold, title case. Level 3 is flush left, bold italic, title case. Levels 4 and 5 are indented, end with a period, and run straight into the paragraph text; level 4 is bold and level 5 is bold italic. A typical undergraduate paper needs two levels at most, and the manual says to use only as many as the length and complexity of the work require. Do not put every paragraph under its own subheading because it looks organized.

In-text citations: author, date, and where they go

The in-text citation has two shapes, and you will use both in the same paper.

A parenthetical citation puts the author and year inside parentheses, separated by a comma, mid-sentence or at the end: “Falsely balanced coverage can distort perceptions of expert consensus (Koehler, 2016).” A narrative citation works the author’s name into your sentence and follows it with the year in parentheses: “Koehler (2016) noted the dangers of falsely balanced coverage.” The narrative form gives the source more weight when you are discussing what a researcher argued; the parenthetical form keeps it in the background when the finding is what matters.

The author element changes with the number of authors, and this is the whole table you need to memorize:

Authors	Parenthetical	Narrative
One	(Luna, 2020)	Luna (2020)
Two	(Salas & D’Agostino, 2020)	Salas and D’Agostino (2020)
Three or more	(Martin et al., 2020)	Martin et al. (2020)

Two things in that table deserve a second look. The ampersand appears only inside parentheses; in running text you write the word “and.” And works with three or more authors take “et al.” from the very first citation. Students who learned the sixth edition still spell out several names the first time out of habit. Stop. First author, et al., year, every time.

Group authors take the organization’s name in place of a surname. If the group has a familiar abbreviation, spell the name out once with the abbreviation in brackets, then use the abbreviation: (National Institute of Mental Health [NIMH], 2020) the first time, (NIMH, 2020) after that.

Direct quotations need one more piece: where in the source the words came from. For fewer than 40 words, put the quotation in quotation marks inside your own sentence and add the page number to the citation, as in (Ervin et al., 2018, p. 470). In a narrative citation the year follows the author’s name and the page number goes in parentheses after the quotation. Quotations of 40 words or more become block quotations: no quotation marks, a new line, the whole block indented half an inch and double-spaced, with the citation after the final punctuation and no period after the closing parenthesis.

One small mark of a careful writer: when you cite the same work again in the same paragraph in narrative form, you may drop the year after the first mention. Parenthetical citations always carry the year. And APA does not use “ibid.” at all.

Building a References entry from four pieces

Students panic here, because the manual holds more than a hundred reference examples and they assume they need all of them. You do not. Every entry, whatever the source type, is assembled from the same four elements in the same order: author, date, title, source. Learn how each behaves and you can build an entry for almost anything.

Author. Surname first, then initials: Author, A. A. Multiple authors are separated by commas, with an ampersand before the last name. Editors of a whole book get “(Ed.)” or “(Eds.)” after their names. A group author is written in full.

Date. The year in parentheses, then a period: (2020). Web pages and news stories take a fuller date, such as (2020, August 26). A work with no date gets (n.d.).

Title. The element that changes shape most. For a standalone work like a book or a web page, the title is italicized and written in sentence case: only the first word, the first word after a colon, and proper nouns are capitalized. For a work inside something larger, like a journal article, the title is plain type, no italics, no quotation marks, still sentence case.

Source. Where the reader can find the work. For a journal article, the journal plus the DOI. For a book, the publisher plus a DOI if one exists. For a web page, the site name and the URL.

Each element ends with a period, except that a DOI or URL at the end of an entry takes no period after it. The whole entry reads as four short sentences, which is a useful check: if you cannot find the four periods, an element is missing or merged.

Three patterns you will use constantly

I would rather you learn three patterns thoroughly than skim thirty. These cover most undergraduate sources, and every other type is a variation.

Journal article. The workhorse of APA. The journal name and volume number are italicized; the issue number sits in parentheses right after the volume, not italicized; then the page range; then the DOI.

Author, A. A., & Author, B. B. (Year). Title of the article in sentence case. Name of the Journal, Volume(Issue), first page to last page. https://doi.org/xxxxx

Include the issue number whenever the journal provides one. It is the element citation generators drop most often.

Book. Author, year, title in italics with sentence case, any edition in parentheses after the title without italics, then the publisher. The seventh edition dropped the publisher’s city, so do not add a location. Print books and ebooks share one format; the platform is not mentioned.

Author, A. A. (Year). Title of the book: Subtitle in sentence case (2nd ed.). Publisher Name. https://doi.org/xxxxx

If the book has no DOI, end the entry after the publisher’s name. Do not name the database you found it in.

Web page. Author or organization, the most specific date available, the page title in italics, the site name, and the URL. When the author and the site name are the same organization, drop the site name.

Organization Name. (Year, Month Day). Title of the web page. Site Name. https://www.example.org/page

A “last updated” date that clearly applies to the content you are citing can serve as the date. Ignore “last reviewed” dates; a review does not mean anything changed.

DOIs and URLs, done the seventh edition way

A DOI is a digital object identifier, a permanent address a publisher assigns to an article or book so it can be found even if the web page moves. When a source has one, include it. When it does not, use a URL that will actually resolve for your reader.

The seventh edition standardized the format, and this is where old habits do the most damage. Write every DOI as a full link beginning with https://doi.org/ followed by the identifier. If the source shows “doi:10.xxxx” or an “http://dx.doi.org/” address, convert it. Do not write “Retrieved from” or “Accessed from” in front of a DOI or URL; the link does that job. Do not put a period after the link, because a trailing period can break it. Either a live hyperlink or plain text is acceptable, but be consistent through the whole list.

Retrieval dates, the “Retrieved March 3, 2026, from” phrase you may remember, have almost vanished. The manual treats a web page with a retrieval date as its own narrow pattern, for content designed to change over time. For an ordinary article, book, or dated web page, leave it out.

Consistency is the whole point

I will end where I began, with the student and her citation generator. The tool was not wrong about everything. It was inconsistent, and inconsistency is what a grader notices first, because it shows the list was assembled rather than written.

So before you submit, do one pass that has nothing to do with content. Start the References list on a new page with the word References centered and bold. Alphabetize by the first word of each entry, usually the first author’s surname. Double-space the whole list with no extra space between entries, and set a half-inch hanging indent so the first line of each entry sits flush left and the rest are indented. Then walk through the text with the list beside you: every citation has an entry, every entry has a citation, years match, every “et al.” is a work with three or more authors, every DOI begins with https://doi.org/ and none of them end in a period.

That pass takes fifteen minutes. It is the difference between a paper assembled from tools and one written by someone who knew what they were doing. Whatever changes when the manual is next revised, that habit will still be worth keeping.