Santogrossi, David A.
Brooks/Cole, 1995
Buku Teks
Carmichael, Leonard, author
Random House, 1957
Buku Teks
Santrock, John W.
McGraw-Hill, 2003
Multimedia
Baron, Robert A., author
Simon & Schuster, 1992
Buku Teks
Gray, Peter, author
Worth Publishers, 1999
Buku Teks