Hyland, Ken
Second language writing
Cambridge University Press, 2007
 Buku Teks SO
Feedback in second language writing; contexts and issues
edited by Ken Hyland, Fiona Hyland
Cambridge University Press , 2006
 Buku Teks SO
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
Dörnyei, Zoltán
Group dynamics in the language classroom
Cambridge University Press, 2004
 Buku Teks SO
Gebhard, Jerry G.
Language teaching awareness: a guide to exploring beliefs and practices
Cambridge University Press, 1999
 Buku Teks SO