Hughes, Arthur
Cambridge University Press, 1994
Buku Teks
Davies, Alan, 1931 February 17-, author
Basil Blackwell, 1990
Buku Teks
Chapelle, Carol A, author
Cambridge University Press, 2006
Buku Teks
Christopher Titford edited
Gunter Narr, 1985
Buku Teks
Cambridge University Press, 2004
Buku Teks