Shelly, Gary B.
Anaheim, 1970
Buku Referensi
Cashman, Thomas J.
California Anaheim, 1970
Buku Teks
Thomas, Alex Jr.
Rinehart- Press, 1971
Buku Teks
Philipson, Graeme
Computer Technology Research, 1992
Buku Referensi
Iik Wilarso
Elex Media Komputindo, 1989
Buku Teks SO