Nunan, David
Penguin English, 1993
Buku Teks
Coulthard, Malcolm, author
Longman, 1985
Buku Teks
Schiffrin, Deborah, author
Blackwell publishing, 1994
Buku Teks
edited by Malcolm Coulthard
Routledge, 1992
Buku Teks
Renkema, Jan, author
John Benjamins, 2004
Buku Teks