APA Style (7th ed.)
Use square brackets to indicate changes to a quotation, such as adding words, explanations, or emphasis. To “emphasize a word or words in a quotation, use italics. Immediately after the italicized words, insert ‘emphasis added’ within square brackets as follows: [emphasis added]” (APA, 2020, p. 275). For example, “They [the judges] were convinced that the swimmer had missed the two-handed [emphasis added] turn.”
Reference
American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed.). https://doi.org/10.1037/0000165-000
