London, 2004
Buku Teks
Kern, Richard, author
Cambridge University Press, 2015
eBooks
August, Diane
Center for Applied Linguistics, 2006
Multimedia
Diane August edited by
Lawrence Erlbaum Associates, Publishers, 2006
Buku Teks
edited by Eric Amsel, James P. Byrnes
Lawrence Erlbaum Associates, 2002
Buku Teks