Stevick, Earl W.
Cambridge Cambridge University Press 1991,
Buku Teks
Dörnyei, Zoltán, author
Cambridge University Press, 2004
Buku Teks
Yalden, Jenice
Cambridge University Press, 1987
Buku Teks
Tsui, Amy B. M., author
Cambridge University Press, 2003
Buku Teks
Brown, James Dean, editor; Coombe, Christine A. (Christine Anne), 1962-, editor
Cambridge University Press, 2015
Buku Teks