Nash, Rederick Frazier, author
University of Wisconsin Press, 1989
Buku Teks
Des Jardins, Joseph R., author
Wadsworth, 1997
Buku Teks
edited by A.T. Dalfovo
The Council for Research in Values and Philosophy , 2002
Buku Teks
Pojman, Louis P., author
Wadsworth and Cengage Learning, 2012
Buku Teks
Gillespie, Alexander, author
Oxford University press, 2014
Buku Teks