Charles, Curtis B.
John Wiley & Sons, 1996
Multimedia
Andleigh, Prabhat K.
Prentice-Hall, 1996
Buku Teks SO
edited by Alistair D.N. Edwards, Simon Holland
Springer-Verlag, 1992
Buku Teks
Olsen, Gary
Ohio North Light Books , 1997
Buku Teks SO
Morris, Mary E.S.
SunSoft Press, 1996
Buku Teks SO