APA (7th ed.) Citation

Hartley, E. L. 1. (1952). Fundamentals of social psychology. Knopf.

Chicago Style (17th ed.) Citation

Hartley, Eugene Leonard 1912. Fundamentals of Social Psychology. New York: Knopf, 1952.

MLA (9th ed.) Citation

Hartley, Eugene Leonard 1912. Fundamentals of Social Psychology. Knopf, 1952.