Allwright, Dick, author
Longman, 1993
Buku Teks
Lemke, J.L. (Jay L.), author
Oxford University Press, 1989
Buku Teks
Stevick, Earl W.
Cambridge Cambridge University Press 1991,
Buku Teks
Richards, Jill, authour
George Allen and Unwin, 1979
Buku Teks
Dörnyei, Zoltán, author
Cambridge University Press, 2004
Buku Teks