Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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