Brandt, Richard B.
Ethical theory: the problems of normative and critical ethics
Prentice-Hall, 1959
 Buku Teks
Irrealism in ethics
Bart Streumer.
Wiley-Blackwell , 2014
 Buku Teks
Albert, Ethel M.
Great traditions in ethics: an introduction
American Book Company, 1953
 Buku Teks
Smith, Michael
Ethics and the a priority: selected essays on moral psychology and meta-ethics
Cambridge University Press , 2004
 Buku Teks
Pojman, Louis P.
Environmental ethics : readings on theory and application
Wadsworth and Cengage Learning, 2012
 Buku Teks