Legg, A. K., author
Haynes Publishing, 1989
Buku Referensi
White, Charles, author
Haynes Publishing, 1992
Buku Referensi
White, Charles, author
Haynes Publishing, 1992
Buku Referensi
Zenith Data Systems, 1986
Buku Teks
Grolle, Carl G., author
Parker Publishing Company, 1977
Buku Referensi