How to Use APA Referencing

Most APA marks are lost to four or five recurring errors, not to obscure source types.

APA style is the standard in psychology, education, nursing and much of the social sciences. It is an author-date system: a short citation in the text points to a full entry in an alphabetical reference list. The 7th edition, published in 2019, changed several long-standing rules, so guidance written before then can be actively misleading.

In-text citations

Every citation needs an author and a year, in one of two forms. Parenthetical: the whole citation sits in brackets – (Okafor, 2021). Narrative: the author becomes part of your sentence – Okafor (2021) found that attendance declined. Use narrative form when the author matters to your argument, parenthetical when the finding matters more than who produced it.

Add a page number for direct quotations and, ideally, for a specific claim: (Okafor, 2021, p. 14). For a range, use pp. For sources without pages, cite a paragraph or section.

Multiple authors – where the 7th edition changed

This is the most common source of outdated practice. In APA 7, a work with three or more authors uses “et al.” from the very first citation – (Chen et al., 2020). The older rule of listing all authors the first time was dropped. Two authors are always both named, joined by an ampersand inside brackets and by “and” in narrative form: (Chen & Diallo, 2020) but Chen and Diallo (2020).

The reference list

Start the list on a new page titled References, centred and bold. Entries run alphabetically by the first author’s surname, with a hanging indent – the first line flush left, subsequent lines indented.

The basic journal article pattern is author, year, title, source, DOI:

• Okafor, A. M. (2021). Attendance patterns in hybrid delivery. Journal of Educational Research, 48(2), 112-129. doi.org/10.xxxx/xxxxx

Note the details that markers check: only the first word of the article title and any proper nouns are capitalised, while the journal name uses headline capitals; the journal name and volume number are italicised but the issue number is not.

Books, chapters and websites

A book follows the same opening pattern, with the publisher replacing the journal. APA 7 removed the publisher location, so “New York, NY:” no longer appears – another place where old habits show. An edited chapter names the chapter author first, then the editors and book. A web page needs the author or organisation, the date, the page title, the site name and the URL, and “Retrieved from” is now used only where the content is likely to change.

Where the marks are actually lost

Across thousands of student papers the same handful of errors recur, and none of them involve exotic source types.

• In-text citations and reference entries that do not match – a source cited but missing from the list, or listed but never cited.
• Using “and” inside brackets instead of an ampersand.
• Capitalising every word of an article title.
• Missing hanging indents.
• Inconsistent DOI formatting, or DOIs omitted where they exist.

Checking these five things before submission catches most of the available marks.

Secondary sources

If you read about a study in another author’s work and cannot access the original, cite it as secondary: (Milgram, 1963, as cited in Okafor, 2021), and list only Okafor in the reference list. Use this sparingly – markers read heavy secondary citation as a sign you have not gone to the sources. Where the original is accessible, read it.

Use a manager, but check its output

Zotero, Mendeley and EndNote will generate APA entries and save hours, and their output is regularly wrong – capitalisation imported incorrectly from a database, missing DOIs, journal names abbreviated when they should be full. Treat generated references as a first draft and check each entry against the pattern. The APA Style website publishes worked examples for almost every source type, and your institution may specify small variations of its own, which take precedence over any general guide.

Sources without an obvious author or date

These cause more confusion than any other category. Where there is no individual author, the organisation becomes the author – (World Health Organization, 2022). Where there is genuinely no author, move the title into the author position and cite a shortened form in the text. Where there is no date, use (n.d.) in both the citation and the reference entry. Resist the temptation to invent a date from a copyright notice at the foot of a page, which often reflects the site rather than the document.

Formatting the wider paper

APA governs more than citations, and marks are attached to the rest of it: double spacing throughout including the reference list, a legible standard font, one-inch margins, and a title page in the format your institution specifies. Headings follow five defined levels with prescribed formatting, and using them consistently makes a long paper markedly easier to read. Check whether your course requires student or professional paper formatting – the two differ in the title page and running head.

Reference management earns its setup cost

Zotero, Mendeley and EndNote all generate APA entries and save hours once you pass roughly twenty sources. The browser connector captures a citation from a database page in one click, which is where most of the time saving comes from.

Their output is reliably imperfect, though. Databases supply inconsistent metadata, so capitalisation, journal names and DOIs all need checking. Treat generated references as a first draft rather than finished text.

Handle the awkward source types

Most confusion concentrates in a few categories. Organisational authors take the organisation’s name in the author position. Sources with no author move the title into that position. Sources with no date use (n.d.). Multiple works by the same author in the same year take letter suffixes — 2021a, 2021b — assigned alphabetically by title.

• Two authors: always name both, with an ampersand inside brackets.
• Three or more: “et al.” from the first citation in APA 7.
• Same surname, different authors: include initials to disambiguate.
• Multiple sources in one citation: alphabetical, separated by semicolons.

Cite AI tools and software correctly

APA 7 now has guidance for generative AI and for software. Where a course permits their use, the tool is normally cited with the developer as author, the year of the version, the name and version number, and the URL. Check your institution’s policy first, since many restrict use regardless of how it is cited.

Format the paper, not just the citations

APA governs the whole document, and marks attach to it: double spacing throughout including references, a consistent legible font, one-inch margins, and headings following the five defined levels. Student papers and professional papers differ in title page and running head, so confirm which your course requires.

Build the reference list as you write

Adding references at the end is how sources get lost and citations end up unmatched. Add each entry the moment you first cite it. Before submission, check in both directions — every in-text citation appears in the list, and every list entry is cited somewhere. Mismatches in either direction are among the easiest marks to lose and the easiest to prevent.

Know where to check

The APA Style website publishes worked examples for almost every source type, and it is authoritative in a way that third-party summaries are not. Where your institution publishes its own variant guide, that takes precedence over the general standard — departmental preferences on things like heading format are common and are what your marker will apply.