APA Style (7th ed.)
When presenting titles of books or reference works in references,
enclose edition information, report numbers, and volume numbers in parentheses after the title. Do not add a period between the title and the parenthetical information. Do not italicize the parenthetical information. If both edition and volume information are included, separate these elements with a comma, placing the edition number first. (American Psychological Association, n.d., Format of the Title section)
Example reference:
Kouzes, J., & Posner, B. (2017). Leadership challenge: How to make extraordinary things happen in organizations (6th ed.). Jossey-Bass.
Reference
American Psychological Association. (n.d.). Elements of reference list entries. APA Style. https://apastyle.apa.org/style-grammar-guidelines/references/elements-list-entry
