APA (7th ed.) Citation

Zimbardo & Gerrig. (1999). Psychology and life (15th ed.). Longman.

Chicago Style (17th ed.) Citation

Zimbardo and Gerrig. Psychology and Life. 15th ed. New York: Longman, 1999.

MLA (8th ed.) Citation

Zimbardo and Gerrig. Psychology and Life. 15th ed. Longman, 1999.