Holmes, R. L. (1998). Basic moral philosophy (2nd ed.). Wadsworth Pub.
Lua i Stíl Chicago (17ú heag.)Holmes, Robert L. Basic Moral Philosophy. 2nd ed. Belmont, CA: Wadsworth Pub, 1998.
Lua MLA (9ú heag.)Holmes, Robert L. Basic Moral Philosophy. 2nd ed. Wadsworth Pub, 1998.
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