Computer Technology Research Corp., 1991
Buku Referensi
Rijanto Tosin
Dinastindo, 1990
Buku Teks
Philipson, Graeme
Computer Technology Research, 1992
Buku Referensi
Flores, Ivan
Prentice-Hall, 1971
Buku Teks SO
Norton, Peter
[publisher not identified], [date of publication not identified]
Buku Teks SO