Thatcher, Joanne, author
Learning Matters, 2012
Buku Teks
edited by Judy L. Van Raalte, Britton W. Brewer
American Psychological Association, 2002
Buku Teks
Lavallee, David, author
McGraw-Hill, Higher Education, 2008
Buku Teks
LeUnes, Arnold, author
Psychology Press, 2008
Buku Teks
Cox, Richard H., author
McGraw-Hill, 2012
Buku Teks