Parker, Steve, author
Parragon, 2000
Buku Referensi
Fahnestock, James D., author
Ziff Publishing, 1959
Buku Teks
Westcott, Charles G., author
Howard W. Sams, 1964
Buku Teks
Hickman, Ian, author
Newnes, 1995
Buku Teks
Leyson, B.W.
New York: E.P. Dutton, 1955
Buku Teks