Eastwood, John, author
Oxford University Press, 1994
Buku Teks
Coe, Graham
Routledge & Kegan Paul, 2005
Multimedia
Coe, Graham
Routledge & Kegan Paul, 2005
Multimedia
Howard, Godfrey, author
Pan Macmillan Publishers, 1993
Buku Referensi
Puchta, Herbert
Cambridge University Press, 2010
Multimedia