Oram, Andrew
O'Reilly & Associates, Inc., 1991
Buku Teks
Tondo, Clovis L.
Prentice-Hall, 1992
Buku Teks
Zells, Lois
QED Information Sciences, 1990
Buku Referensi
Dougherty, Dale
O"Reilly & Associates, Inc., 1992
Buku Teks
Tare, Ramkrishna S.
McGraw-Hill, 1988
Buku Teks