APA Formatting Guide: Citations, References, and Paper Structure Explained

APA formatting extends far beyond adding (Author, Year) after paraphrases. The Publication Manual specifies how your entire document should look—from the title page and abstract through heading hierarchy, table layout, and the reference list. Students often master in-text citations while neglecting structural requirements, producing papers that feel 'almost APA' but fail on closer inspection. This guide focuses specifically on the three pillars of APA formatting: paper structure, citations, and references—with the detail you need for theses, dissertations, and journal manuscripts.

Paper structure: the standard APA skeleton

1. 1Title page with title, author, affiliation, course, instructor, date (student papers).
2. 2Abstract on separate page with keywords.
3. 3Body text beginning with introduction (not labelled 'Introduction' in APA 7 student papers at Level 1 in some contexts—check instructor preference).
4. 4Method, Results, Discussion for empirical papers—or thematic sections for literature reviews.
5. 5References starting on a new page.
6. 6Appendices for supplementary material if needed.

Section labels and heading hierarchy

Empirical APA papers traditionally include Method, Results, and Discussion as Level 1 headings. Literature reviews use thematic Level 1 headings instead. Subsections progress through Levels 2–5 without skipping. Every heading level has distinct formatting—bold, italic, alignment, and indentation—defined in APA 7 Chapter 2.

In-text citations: rules and edge cases

Basic paraphrase: (Author, Year). Narrative citation: Author (Year) argued that… Direct quote: (Author, Year, p. XX). No author: use title in quotes for articles or italics for books, plus year. Organisation author: spell out first time, abbreviate thereafter if well known—(World Health Organization [WHO], 2023). Secondary source: (Original Author, Year, as cited in Secondary Author, Year)—use sparingly.

Multiple authors in APA citations

• One author: (Smith, 2023) every time.
• Two authors: (Smith & Jones, 2023) for all citations.
• Three or more: (Smith et al., 2023) from first citation in APA 7.
• Group author with abbreviation: (National Institute of Mental Health [NIMH], 2023) then (NIMH, 2023).

Reference list: core formatting principles

Alphabetical by surname. Hanging indent 0.5 inch. Double-spaced. DOIs as https://doi.org links. No 'Retrieved from' before DOIs. Italicise book titles, journal titles, and volume numbers. Do not italicise article titles. Capitalise only the first word of article titles, subtitles, and proper nouns (sentence case).

Reference templates by source type

Journal article with DOI: Author, A. A., & Author, B. B. (Year). Title of article. Title of Periodical, volume(issue), page–page. https://doi.org/xxxxx

Book: Author, A. A. (Year). Title of book (Edition). Publisher Name. DOI or URL if ebook.

Edited book chapter: Author, A. A. (Year). Title of chapter. In E. E. Editor (Ed.), Title of book (pp. xx–xx). Publisher.

Webpage: Author, A. A. (Year, Month Day). Title of page. Site Name. URL

Tables: APA structure requirements

• Number tables sequentially: Table 1, Table 2.
• Italicise table number and title on line above table.
• Use horizontal rules sparingly—APA tables avoid vertical lines.
• Include table notes below for abbreviations and explanations.
• Refer to each table in body text before it appears.

Figures: APA structure requirements

• Number figures sequentially: Figure 1, Figure 2.
• Italicise figure number and title on line below figure.
• Ensure resolution meets publication standards (300 dpi for print).
• Include copyright attribution in figure note if reproduced.

Numbers, statistics, and units in APA

Spell out numbers one through nine in general text; use numerals for 10 and above. Always use numerals for ages, scores, statistics, percentages, and dates. Report statistics with appropriate decimal places: M, SD, t, F, p, df, η². Italicise statistical symbols and letters: N for total sample, n for subsample.

Common structural APA errors

• Missing or incorrectly formatted abstract and keywords.
• Wrong heading level formatting (e.g., all headings centred and bold).
• Reference list not starting on a new page.
• Inconsistent double spacing in references.
• Tables and figures without in-text callouts.
• Running head formatted incorrectly on professional papers.

Building an APA-compliant thesis from chapters

Theses often combine institutional front matter with APA body formatting. Strategy: apply APA heading styles to core chapters; keep university-required preliminary pages separate; unify reference list at end using one APA 7 style throughout. Merge chapter reference lists before final formatting—duplicate entries and inconsistent styles are common when chapters were drafted separately.

Tools and professional support

Reference managers handle much of APA formatting automatically, but thesis-level documents need human verification. Professional APA formatting services audit structure, citations, and references together—catching the gaps software misses.