APA (7th ed.) Citation

Gates, A. I. (1928). Elementary psychology (Rev. ed.). Macmillan Co.

Chicago Style (17th ed.) Citation

Gates, Arthur Irving. Elementary Psychology. Rev. ed. New York: Macmillan Co, 1928.

MLA (9th ed.) Citation

Gates, Arthur Irving. Elementary Psychology. Rev. ed. Macmillan Co, 1928.