Santrock, John W., author
W.C. Brown Publisher, 1991
Buku Referensi
Passer, Michael W
McGraw-Hill, 2007
Multimedia
Isaacson, Robert L., author
Harper & Row, 1965
Buku Teks
Carlson, Neil R., author
Allyn and Bacon, 1993
Buku Teks
Carlson, Neil R., author
Allyn and Bacon , 1997
Buku Teks