Wolgemuth, Amy, author
Master Publishing, Inc., 1998
Buku Teks
Graham, David T., author
Prentice-Hall, 2000
Buku Teks
Flynn, Peter, author
International Thomson , 1995
Buku Teks
IDG Books Worldwide, Inc., 1999
Buku Referensi
Chu, Kenny, author
McGraw-Hill, 1996
Buku Teks