Walker, Hill M., author
Wadsworth, 2004
Buku Teks
Rutter, Michael, author
Cambridge University Press, 1998
Buku Teks
Morphet, Edgar L. (Edgar Leroy), 1895- , author
Prentice-Hall, 1982
Buku Teks
Oxford University Press , 1990
Buku Teks
Hirsch, Barton J, author
American Psychological Association, 2005
Buku Teks