Harman, G. (1977). The nature of morality: An introduction to ethics. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Harman, Gilbert. The Nature of Morality: An Introduction to Ethics. New York: Oxford University Press, 1977.
Lua MLA (8ú heag.)Harman, Gilbert. The Nature of Morality: An Introduction to Ethics. Oxford University Press, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.