Hobhouse, L., & Ginsberg, M. (1951). Morals in evolution: A study in comparative ethics (7th ed.). Chapman & Hall.
Lua i Stíl Chicago (17ú heag.)Hobhouse, L.T, agus Morris Ginsberg. Morals in Evolution: A Study in Comparative Ethics. 7th ed. London: Chapman & Hall, 1951.
Lua MLA (8ú heag.)Hobhouse, L.T, agus Morris Ginsberg. Morals in Evolution: A Study in Comparative Ethics. 7th ed. Chapman & Hall, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.