APA (7th ed.) Zitazioa

Foot, P. (1967). Theories of Ethics: Theories of Ethics. Oxford University Press.

Chicago Style (17th ed.) Zitazioa

Foot, Philippa. Theories of Ethics: Theories of Ethics. Oxford: Oxford University Press, 1967.

MLA (9th ed.) Zitazioa

Foot, Philippa. Theories of Ethics: Theories of Ethics. Oxford University Press, 1967.