Candida Castro, editor
CRC Press, Taylor & Francis Group, 2009
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
Barlow, David H., author
Thomson , 2005
Buku Teks