APA (7th ed.) Citation

Caplan, A. L., & Callahan, D. (1981). Ethics in hard times. Plenum Press.

Chicago Style (17th ed.) Citation

Caplan, Arthur L., and Daniel Callahan. Ethics in Hard Times. New York: Plenum Press, 1981.

MLA (9th ed.) Citation

Caplan, Arthur L., and Daniel Callahan. Ethics in Hard Times. Plenum Press, 1981.