Wolgemuth, Amy, author
Master Publishing, Inc., 1998
Buku Teks
Gach, Gary, author
Pocket Book, 1996
Buku Teks
Kent, Peter, author
Prentice Hall of India, 1996
Buku Teks SO
Kent, Peter, author
Andi, 1996
Buku Teks SO
Grimes, Galen A., author
QUE, 1996
Buku Teks SO