APA (7th ed.) Citation

Caplan, A. L., & Jennings, B. (1984). Darwin, Marx, and Freud: Their influence on moral theory. Plenum Press.

Chicago Style (17th ed.) Citation

Caplan, Arthur L., and Bruce Jennings. Darwin, Marx, and Freud: Their Influence on Moral Theory. New York ; London: Plenum Press, 1984.

MLA (9th ed.) Citation

Caplan, Arthur L., and Bruce Jennings. Darwin, Marx, and Freud: Their Influence on Moral Theory. Plenum Press, 1984.