Foot, P. (1967). Theories of ethics. Oxford U.P..
Cita Chicago (17th ed.)Foot, Philippa. Theories of Ethics. London: Oxford U.P., 1967.
Cita MLA (8th ed.)Foot, Philippa. Theories of Ethics. Oxford U.P., 1967.
Atenció: Aquestes cites poden no estar 100% correctes.