Valley, John J.
Sams, 1992
Buku Referensi
Frakes, William Bruce, 1852-
Prentice-Hall, 1991
Buku Teks SO
Osman, Mohammed
Artech House, 1996
Buku Teks SO
Kelley, Al.
The Benjamin Cumming Pub., 1984
Buku Teks SO
Traister, Robert J.
M&T Books, 1991
Buku Teks SO