Cita APA (7th ed.)

Rachels, J. (1993). The elements of moral philosophy (2nd.ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Rachels, James. The Elements of Moral Philosophy. 2nd.ed. New York: McGraw-Hill, 1993.

Cita MLA (9th ed.)

Rachels, James. The Elements of Moral Philosophy. 2nd.ed. McGraw-Hill, 1993.