Kymlicka, Will, author
Clarendon Press, 1990
Buku Teks
Schumaker, Paul, author
Blackwell Publishing, 2008
Buku Teks
Tannenbaum, Donald G., author
Wadsworth/Thomson learning, 2004
Buku Teks
edited by Thomas Christiano and John Christman
John Wiley & Sons, 2007
Buku Teks
Pojman, Louis P., author
McGraw-Hill , 2003
Buku Teks