APA

Hartley E. L., Hartley R. E., . (1952). Fundamentals of social psychology. New York: Knopf.

Chicago

Hartley Eugene Leonard, Hartley Ruth E, . 1952. Fundamentals of social psychology. New York: Knopf.

Harvard

Hartley E. L., Hartley R. E., . (1952). Fundamentals of social psychology. New York: Knopf.

MLA

Hartley Eugene Leonard, Hartley Ruth E, . Fundamentals of social psychology. New York: Knopf. 1952.