APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Plenum Publishing, Arthur Leonard Caplan, and Daniel Callahan. Ethics in Hard Times. New York ; London: Plenum Press, 1981.

MLA (9th ed.) Citation

Plenum Publishing, et al. Ethics in Hard Times. Plenum Press, 1981.