Rutter, Michael
Cambridge University Press, 1998
Buku Teks
Morphet, Edgar L. (Edgar Leroy), 1895-
Prentice-Hall, 1982
Buku Teks
Oxford University Press , 1990
Buku Teks
David M. Stoff, James Breiling, and Jack D. Maser, editors
John Wiley & Sons, 1997
Buku Referensi
Hirsch, Barton J
American Psychological Association, 2005
Buku Teks