Pervin, L. A., & John, O. P. (1997). Personality: Theory and research (7th ed.). John Wiley.

Pervin, Lawrence A., and Oliver P. John. Personality: Theory and Research. 7th ed. New York: John Wiley, 1997.

Pervin, Lawrence A., and Oliver P. John. Personality: Theory and Research. 7th ed. John Wiley, 1997.