Abboud, Peter F, author
Cambridge University Press, 1983
eBooks
Mauger, G., author
Librairie, 1955
Buku Teks
Carpenter, Catrine, author
Gramedia Widiasarana Indonesia, 2000
Buku Teks
Coultas, Barbara, author
Teach Yourself Books, 1990
Buku Teks
Bower, Malcolm
Hodder & Stoughton, 1977
Buku Teks