Chafe, William Henry
Oxford University Press, 1995
Buku Teks
Davies, Paul
Simon & Scuster , 1995
Buku Teks
Inten Gumilang, author
Fakultas Teknik Universitas Indonesia, 2015
UI - Skripsi (Membership)
Brunei Press Sdn Bhd, 1999
Buku Referensi
Universitas Indonesia, 2007
UI - Skripsi (Membership)