Wesson, Nicky
Optima , 1995
Buku Teks
Pelletier, Kenneth R., author
A Fireside Book, 2002
Buku Teks
Drury, Nevill
Hale & Iremonger , 1983
Buku Teks
Shealy, C. Norman, author
Element, 1998
Buku Referensi
Labriola, Dan, author
A Division of Prima Publishing, 2000
Buku Teks