McGraw-Hill, 1982
Buku Referensi
Hein, Mathias
International Thomson Computer Press, 1997
Buku Teks
Tangney, Brendan
Prentice-Hall, 1988
Buku Teks
editor, Geoffrey Carter ; contributors Lynda Edwards ... [et al.]
Heinemann Computers in Education published in conjuction with International Computers, 1984
Buku Teks
Keiser, Gerd, editor
McGraw-Hill, 2002
Buku Teks SO