Luper, Steven
Mayfield Publishing Company, 1999
Buku Teks
Sterba, James P.,, author
Thomson, 2003
Buku Teks
Barusch, Amanda Smith, author
Brooks / Cole, 2009
Buku Teks
edited by David Boucher and Paul Kelly
Routledge, 1998
Buku Teks
Ken-ichi Ohbuchi, editor; Leonie R. Stickland, translator
Trans Pacific Press, 2007
Buku Teks