Cita APA (7a ed.)

Rachels, S., & Rachels, J. (2019). The elements of moral philosophy (Ninth edition.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Rachels, Stuart, y James Rachels. The Elements of Moral Philosophy. Ninth edition. New York: McGraw-Hill, 2019.

Cita MLA (9a ed.)

Rachels, Stuart, y James Rachels. The Elements of Moral Philosophy. Ninth edition. McGraw-Hill, 2019.