Harvey, Chris
Chancellor Press, 1987
Buku Teks SO
Santrock, John W.
McGraw-Hill Science/Engineering/Math, 2005
Multimedia
Bowker- Saur, 1996
Multimedia
Littauer, Florence
Binarupa aksara, 1995
Buku Teks SO
Santrock, John W.
McGraw-Hill, 2005
Multimedia