Raphael, D. D. (1994). Moral philosophy (2nd, enl. ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Raphael, D. D. Moral Philosophy. 2nd, enl. ed. Oxford ; New York: Oxford University Press, 1994.
Lua MLA (8ú heag.)Raphael, D. D. Moral Philosophy. 2nd, enl. ed. Oxford University Press, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.