Siyan, Karanjit
New Riders, 1995
Buku Teks SO
Jorgensen, Carolyn
Brandy, 1990
Buku Teks SO
Ross, John
Dinastindo, [Date of publication not identified]
Buku Teks SO
Siswanto
Fakultas Ilmu Komputer Universitas Indonesia, 1991
UI - Skripsi Membership
Amon, Elenore M.
Prentice-Hall, 1991
Buku Teks SO