Allwright, Dick, author
Cambridge University Press, 1991
Buku Teks
Dörnyei, Zoltán, author
Cambridge University Press, 2014
Buku Teks
Wallace, Michael J., author
Cambridge University Press, 2004
Buku Teks
Brown, James Dean, author
Cambridge University Press, 1988
Buku Teks
Kroll, B.
Cambridge University Press, 1990
Buku Teks