Lindgran, Henry Clay
John Wiley & Sons, 1966
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
Ciccarelli, Saundra K., author
Pearson - Prentice Hall, 2006
Buku Teks