McClure, Rhyder
Brady, 1990
Buku Teks SO
Buser, Susanne
Elex Media Komputindo, 1992
Buku Teks SO
Stultz, Russell A.
Wordware Publ, 1992
Buku Teks SO
Holt, Jack A.
Richard D. Irwin , 1990
Buku Teks SO
Hoskin, Robert E.
Prentice-Hall, 1986
Buku Teks SO