Littlewood, William
Communicative language teaching : an introduction
Cambridge Uniiversity Press , 1983
 Buku Teks
Littlewood, William
Communicative language teaching : an introduction
Cambridge University Press, 1994
 Buku Teks
Nunan, David
Designing tasks for the communicative classroom
Cambrigde University Press , 1993
 Buku Teks
Littlewood, William
Comnunicative language teaching : an introduction
Cambridge University Press, 1998
 Buku Teks
The effect of communicative language teaching and direct method on students' ability in writing narrative text grade XI-2 and XI-3 SMAN 2 Kabanjahe
 Artikel Jurnal