Duffy, Karen G.
New Jersey, 2005
Buku Teks
edited by Gordon H. Bower
Random House, 1987
Buku Teks
by Richard R. Bootzin [and others]
Mcgraw-Hill , 1991
Buku Teks
Hoffman, Lois
McGraw-Hill, 1994
Buku Teks
Carlson, Neil R.
Allyn and Bacon, [date of publication not identified]
Buku Teks