Pojman, Louis P.
Environmental ethics : readings on theory and application
Wadsworth and Cengage Learning, 2012
 Buku Teks
Irrealism in ethics
Bart Streumer.
Wiley-Blackwell , 2014
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Kagan, Shelly
Normative Ethics
Westview Press, 1997
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Readings in ethical theory
selected and edited by Wilfrid Sellars and John Hospers
Appleton-Century-Crofts, 1952
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Albert, Ethel M.
Great traditions in ethics: an introduction
American Book Company, 1953
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