APA (7th ed.) Citation

Karn, H. W., & Weitz, J. (1955). An introduction to psychology. Wiley.

Chicago Style (17th ed.) Citation

Karn, Harry W., and Joseph Weitz. An Introduction to Psychology. New York: Wiley, 1955.

MLA (9th ed.) Citation

Karn, Harry W., and Joseph Weitz. An Introduction to Psychology. Wiley, 1955.