Schiffrin, Deborah, author
Blackwell , 2000
Buku Teks
Schiffrin, Deborah, author
Blackwell publishing, 1994
Buku Teks
Cook, Guy (Guy W. D.), author
Oxford University Press , 1993
Buku Teks
Nunan, David
Penguin English, 1993
Buku Teks
Coulthard, Malcolm, author
Longman, 1985
Buku Teks