Somerson, Paul
Bantam Books , 1990
Buku Teks
Maulana Muzaqi, author
Fakultas Ilmu Komputer Universitas Indonesia, 2008
UI - Tesis (Open)
Leonardo Pasini, author
TASK, 2017
Artikel Jurnal
Budi Sutedjo Dharma Oetomo, author
Andi, 2003
Buku Teks
Burren, J.W., author
Clarendon Press , 1989
Buku Teks