APA (7th ed.) Citation

Ryckman, R. M. (1989). Theories of personality (4th ed.). Brooks/Cole.

Chicago Style (17th ed.) Citation

Ryckman, Richard M. Theories of Personality. 4th ed. Pacific Grove, Calif: Brooks/Cole, 1989.

MLA (9th ed.) Citation

Ryckman, Richard M. Theories of Personality. 4th ed. Brooks/Cole, 1989.