Barnett, Jeffrey E., author
American Psychological Association, 2012
Buku Teks
Pope, Rob, author
Routledge, 2005
Buku Teks
edited by Charlie Brooker and Julie Repper
Balliere Tindall, 1998
Buku Teks
Woody, Robert Henley, author
Jossey-Bass, 1989
Buku Teks
Sage Publications, 1997
Buku Teks