Holmes, R. L. (2007). Basic moral philosophy (4th ed.). Thomson Wadsworth.
Lua i Stíl Chicago (17ú heag.)Holmes, Robert L. Basic Moral Philosophy. 4th ed. Australia: Thomson Wadsworth, 2007.
Lua MLA (9ú heag.)Holmes, Robert L. Basic Moral Philosophy. 4th ed. Thomson Wadsworth, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.