Gramedia Pustaka Utama, 2005
Buku Teks
Hartmann, Reinhard R.K.
Routledge, 1998
Buku Referensi
Himus, Godfrey W.
Harmondsworth, Middlesex, 1954
Buku Referensi
RIddle, K. Wilkinson
London Arco 1962
Buku Referensi
Brewer, E. Cobham
New York, Harper Brothers
Buku Referensi