APA (7th ed.) Citation

Pillsbury, W. B. (1921). The essentials of psychology (Rev. ed.). Macmillan Co..

Chicago Style (17th ed.) Citation

Pillsbury, W. B. The Essentials of Psychology. Rev. ed. New York: Macmillan Co., 1921.

MLA (9th ed.) Citation

Pillsbury, W. B. The Essentials of Psychology. Rev. ed. Macmillan Co., 1921.