Hospers, J. (1972). Human conduct: Problems of ethics. Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)Hospers, John. Human Conduct: Problems of Ethics. New York: Harcourt Brace Jovanovich, 1972.
Lua MLA (9ú heag.)Hospers, John. Human Conduct: Problems of Ethics. Harcourt Brace Jovanovich, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.