Jung, G.G., author
Meridian Books, 1956
Buku Teks
Miller, George A., author
Basic Books, 1967
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