Persaud, Raj, author
Bantam Press, 2005
Buku Teks
Stanley, Thomas J., author
Andrews McMeel, 2000
Buku Teks
Santrock, John W., author
W.C. Brown Publisher, 1991
Buku Referensi
Passer, Michael W
McGraw-Hill, 2007
Multimedia
Highet, Gilbert, author
Columbia University Press, 1954
Buku Teks