Valley, John J., author
Sams, 1992
Buku Referensi
Frakes, William Bruce, 1852-, author
Prentice-Hall, 1991
Buku Teks SO
Feuer, Alan R., author
Prentice-Hall, 1982
Buku Teks
Osman, Mohammed, author
Artech House, 1996
Buku Teks
Kay, Judy, author
Addison-Wesley, 1989
Buku Teks SO