Cita APA (7a ed.)

Rachels, J., & Rachels, S. (2003). The elements of moral philosophy (4th ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Rachels, James, y Stuart Rachels. The Elements of Moral Philosophy. 4th ed. Boston: McGraw-Hill, 2003.

Cita MLA (9a ed.)

Rachels, James, y Stuart Rachels. The Elements of Moral Philosophy. 4th ed. McGraw-Hill, 2003.