Sharon, D.
Elex Media Komputindo, 1992
Buku Teks
Simons, Geoffrey L.
England: The National Computing Centre, 1980
Buku Teks
Lammineur, P.
Pergamon Press, 1984
Buku Teks
McGraw-Hill Book Comp., 1988
Buku Teks
N-Nagy, Francis
Prentice-Hall, 1987
Buku Teks