Gramedia Pustaka Utama, 2005
Buku Teks
Echols, John M.
Gramedia, 1990
Buku Referensi
Anceaux, Johannes Cornelis, 1920-
Foris Publications, 1987
Buku Referensi
Peter Salim
Modern English Press, 1989
Buku Referensi
Peter Salim
Modern English Press, 1993
Buku Referensi