Mackie, J. L. (1987). Hume's Moral Theory: J. L. Mackie (Reprint.). Routledge & Kegan Paul.
Lua i Stíl Chicago (17ú heag.)Mackie, John Leslie. Hume's Moral Theory: J. L. Mackie. Reprint. London [u.a.]: Routledge & Kegan Paul, 1987.
Lua MLA (8ú heag.)Mackie, John Leslie. Hume's Moral Theory: J. L. Mackie. Reprint. Routledge & Kegan Paul, 1987.
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