Prentice-Hall, 1990
Buku Teks
edited, H.S.M. Zedan
IOS Press, 1990
Buku Teks
Kerridge, Jon, author
Blackwell, 1987
Buku Teks
Marpaung, Toga Halomoan, author
Fakultas Ilmu Komputer Universitas Indonesia, 1993
UI - Skripsi (Membership)
Jones, Geraint, author
Prentice-Hall, 1988
Buku Teks