APA Style is a “down” style, meaning that words are lowercase unless there is specific guidance to capitalize them. For example, capitalize the first word of a sentence, unless the sentence begins with the name of a person whose name starts with a lowercase letter.

The Publication Manual contains guidance on how to capitalize words beginning a sentence; proper nouns and trade names; job titles and positions; diseases, disorders, therapies, theories, and related terms; titles of works and headings within works; titles of tests and measures; nouns followed by numerals or letters; names of conditions or groups in an experiment; and names of study factors, variables, and effects. Only a subset of the guidance is presented on the website to answers users’ most common questions.

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Capitalization is covered in Chapter 6 of the APA Publication Manual, Seventh Edition

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