Italy : International Publications Series, October 1991,
Buku Referensi
Zeadally, Sherali
Springer International Publishing, 2015
eBooks
Bates, Regis J.
McGraw-Hill, 1994
Buku Teks
Springer Singapore, 2019
eBooks
Wilson N. Andrew
Fakultas Teknik Universitas Indonesia, 2005
UI - Skripsi (Membership)