APA (7th ed.) Citation

Schultz, D. P., & Ellen Schultz, S. (2009). Theories of personality (9th ed.). Wadsworth Cengage Learning.

Chicago Style (17th ed.) Citation

Schultz, Duane P., and Sydney Ellen Schultz. Theories of Personality. 9th ed. Belmont: Wadsworth Cengage Learning, 2009.

MLA (9th ed.) Citation

Schultz, Duane P., and Sydney Ellen Schultz. Theories of Personality. 9th ed. Wadsworth Cengage Learning, 2009.