edited by Lorraine Eden
St. Martin's Press, 1993
Buku Teks
Pojman, Louis P., author
McGraw-Hill , 2003
Buku Teks
edited by Roger Keil ... [et al.]
Routledge, 1998
Buku Teks
Clark, David, 1946-, author
Routledge, 1996
Buku Teks
Beck, Ulrich, author
Malden, MA :Polity Press, 2005
Buku Teks