Cambridge University Press, 2007
Buku Referensi
Faiq Miftakhul Falakh, author
Fakultas Ilmu Komputer Universitas Indonesia, 2013
UI - Skripsi Membership
Rademaker, Alexandre, editor
Springer, 2012
eBooks
Baarde, Franz, author
Cambridge University Press, 2017
Buku Teks
Clarke, Irwin & Company Limited, 1959
Buku Teks SO