Cita APA (7th ed.)
Ryckman, R. (1985). Theories of personality (4th ed.). Brooks/cole publ Co..
Cita Chicago (17th ed.)
Ryckman, Richard. Theories of Personality. 4th ed. Pacific Grove, California: Brooks/cole publ Co., 1985.
Cita MLA (9th ed.)
Ryckman, Richard. Theories of Personality. 4th ed. Brooks/cole publ Co., 1985.
Atenció: Aquestes cites poden no estar 100% correctes.