Honachefsky, William B., author
Noyes Pub., 1991
Buku Referensi
Lee, Vinny, author
Page One Publishing, 2003
Buku Referensi
Jermias Perkasa, author
Fakultas Ilmu Komputer Universitas Indonesia, 2004
UI - Skripsi (Membership)
Primavera Systems, Inc., 1993
Buku Teks
edited by Marc H. Bornstein
Lawrence Erlbaum associates, Publishers, 2002
Buku Teks