Gibney, Matthew J., author
Cambridge University Press, 2004
Buku Teks
Farrell, Anne-Maree, 1964-, author
Cambridge University Press, 2012
Buku Teks
edited by Tinatin Bocorivili; Sweet William; Daniel Ahern
Council for Research in Values and Philosophy, 2005
Buku Teks
Pluto Press , 2003
Buku Teks
Johannesen, Richard L., author
Waveland Press, 1983
Buku Teks