Mastering APA style requires navigating dozens of precise formatting rules that change between editions, source types, and discipline requirements. When students and researchers need definitive answers, they turn to the Purdue Online Writing Lab, widely regarded as the gold standard for digital citation guidance. But knowing the OWL exists and knowing how to efficiently apply its 7th edition guidelines without losing hours to formatting errors are two different things.
This guide breaks down the core structural, citation, and reference mechanics mandated by the latest APA standards. Whether you're setting up a fresh document or fixing tricky reference entries for an institutional submission, you'll find the exact rules, concrete examples, and common traps explained below.
Document Setup and Structural Requirements
Before writing a single sentence of your abstract or body text, your document layout must match strict American Psychological Association parameters. Unlike MLA or Chicago styles, APA prioritizes clean, highly legible presentation designed for blind peer review.
Page Margins, Fonts, and Spacing
Set your word processor to use one-inch margins on all sides (top, bottom, left, and right).
For fonts, the 7th edition expands acceptable choices to ensure accessibility. You can use standard fonts like 12-point Times New Roman, 11-point Calibri, 11-point Arial, 11-point Georgia, or 10-point Lucida Sans Unicode. Maintain double-spacing across the entire document—including the title page, block quotes, and reference list—with no extra blank lines inserted between paragraphs.
The Title Page Layout
Professional student papers require specific elements arranged in a precise vertical and horizontal hierarchy.
- Page Number: Place the page number in the top right corner of the header, starting at page 1.
- Paper Title: Positioned in the upper half of the page, bolded, and centered in title case. Keep it concise, avoiding unnecessary subtitles or jargon.
- Author Name: Your full name centered below the title, with a double space separating them.
- Institutional Affiliation: University or department name centered on the next line.
- Course Number and Name: Included for student papers (e.g., PSY 101: Introduction to Psychology).
- Instructor Name: Listed below the course information.
- Due Date: Written in month-day-year format (e.g., November 3, 2026).
In-Text Citations: Author-Date Mechanics
In-text citations point readers directly to your source list while protecting your research from accidental plagiarism. APA relies exclusively on an author-date format. Whenever you quote directly, paraphrase an idea, or reference specific data points, you must include the author's last name and the publication year.
Parenthetical vs. Narrative Citations
You can integrate citations into your sentences in two distinct ways depending on your sentence structure:
- Parenthetical Citation: Place both the author and year in parentheses at the end of the sentence before the terminal punctuation. For example: Recent findings suggest a strong correlation between sleep deprivation and cognitive decline (Smith, 2023).
- Narrative Citation: Weave the author's name directly into the sentence text, followed immediately by the publication year in parentheses. For example: Smith (2023) argued that sleep deprivation severely impacts cognitive performance.
When quoting directly, you must always include the exact page number or paragraph locator. For example: (Smith, 2023, p. 45) or according to Smith (2023, p. 45).
Handling Multiple Authors Correctly
Citation structures shift depending on how many researchers contributed to the work:
- One Author: (Miller, 2021) or Miller (2021)
- Two Authors: Always cite both names joined by an ampersand in parenthetical citations—(Miller & Davis, 2021)—or the word "and" in narrative text—Miller and Davis (2021).
- Three or More Authors: Use the first author's last name followed by "et al." right from the first citation. For example: (Johnson et al., 2022).
Building the Reference List
Every in-text citation must correspond to a full entry in your reference list, positioned on a new page at the end of your document with the centered, bold heading "References". Entries require a hanging indent, meaning the first line of each entry flushes left while subsequent lines indent by 0.5 inches.
Alphabetize your reference entries by the author's last name. If you have multiple works by the same author, arrange them chronologically by publication year, starting with the oldest.
Common Source Formats
Structuring citations accurately prevents formatting penalties. Here is how to format the most common academic sources under 7th edition rules:
- Authored Book: Author, A. A. (Year of publication). Title of work: Capital letter also for subtitle. Publisher Name. https://doi.org/xxxx
- Peer-Reviewed Journal Article: Author, A. A., & Author, B. B. (Year). Title of the specific article without capitalization of subtitles. Name of Periodical in Italics, Volume(Issue), page range. https://doi.org/xxxx
- Website with Individual Author: Author, A. A. (Year, Month Day). Title of individual web page. Site Name. URL
When a digital object identifier (DOI) is available, format it as a full URL starting with https://doi.org/ rather than listing "DOI: 10.xxxx/...". If a web source lacks a formal publication date, use the abbreviation (n.d.) in place of the year.
Avoiding Common APA Formatting Traps
Even experienced writers trip over subtle citation rules. Watch out for these frequent mistakes when polishing your final draft:
- Over-Citing Quotes: Failing to include page numbers when quoting directly from a source is one of the most common point-loss triggers in academic grading.
- Reference List Mismatches: Including sources in your reference list that you never actually cited in the body text—or vice versa—violates core APA completeness rules.
- Abusing "et al.": Using "et al." for two-author sources is incorrect. You must list both authors every time for two-author references.
- Italicizing Journal Volume Numbers: In journal entries, the periodical name and the volume number must be italicized, but the issue number inside parentheses and the page numbers remain in standard roman type.
Frequently Asked Questions
Do I need to include a running head on a student paper?
No. Under the 7th edition guidelines, running heads are required only for professional manuscripts submitted for publication. Student papers require only the page number in the top right corner unless your instructor explicitly requests otherwise.
How do I cite a source quoted inside another source?
When you must cite a secondary source—meaning you found a quote by Author A cited inside a book by Author B—use a secondary source citation format. Name the original work in your narrative, but cite the secondary source where you actually found it. For example: (as cited in Davis, 2022). Only list Davis in your reference list.
What should I do if a web article has no author listed?
Move the title of the article to the author position in both your in-text citation and your reference list entry. For in-text citations, use the first few words of the title in quotation marks along with the year: ("Understanding Citations," 2021).
Are DOIs required for every online journal article?
Yes, whenever a DOI is assigned to an article or book, you must include it in the reference list entry. If an online source has no DOI and is not a database-exclusive document, provide the direct URL of the source instead.
