Hudson, W. D. (1970). Modern moral philosophy. Macmillan.
Cita Chicago (17th ed.)Hudson, W. D. Modern Moral Philosophy. London: Macmillan, 1970.
Cita MLA (8th ed.)Hudson, W. D. Modern Moral Philosophy. Macmillan, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.