Graham & Trotman, 1995
Buku Teks
Beckman, Robert L., author
Westview Press, 1985
Buku Teks
Jackson, W.A. Douglas, author
D. Van Nostrand, 1968
Buku Teks
editor, Chaidier S. Bamualim, Dick van der Meij; Karlina Helmanita
Pusat Bahasa dan Budaya UIN, 2003
Buku Teks
Whately, Alice
Hongkong : Page One Publishing, 2002,
Buku Referensi