Schultz, D. P., & Schultz, S. E. (2009). Theories of personality (9th ed.). Thomson/Wadsworth.
Cita Chicago (17th ed.)Schultz, Duane P., i Sydney Ellen Schultz. Theories of Personality. 9th ed. Australia: Thomson/Wadsworth, 2009.
Cita MLA (9th ed.)Schultz, Duane P., i Sydney Ellen Schultz. Theories of Personality. 9th ed. Thomson/Wadsworth, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.