APA (7th ed.) Citation

Pennington, L. A., & Berg, I. A. (1966). An introduction to clinical psychology (3rd ed.). Ronald Press.

Chicago Style (17th ed.) Citation

Pennington, Leon Alfred, and Irwin August Berg. An Introduction to Clinical Psychology. 3rd ed. New York: Ronald Press, 1966.

MLA (9th ed.) Citation

Pennington, Leon Alfred, and Irwin August Berg. An Introduction to Clinical Psychology. 3rd ed. Ronald Press, 1966.