Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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