Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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