Holmes, R. L. (1993). Basic moral philosophy. Wadsworth Pub. Co.
Lua i Stíl Chicago (17ú heag.)Holmes, Robert L. Basic Moral Philosophy. Belmont, Calif: Wadsworth Pub. Co, 1993.
Lua MLA (9ú heag.)Holmes, Robert L. Basic Moral Philosophy. Wadsworth Pub. Co, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.