An analysis of the lexical errors in translating English text into Bahasa Indonesia done by the students of English Department University of HKBP Nommensen Medan
 Artikel Jurnal
Hyland, Ken
Second language writing
Cambridge University Press, 2007
 Buku Teks SO
Exploring the dynamics of second language writing
Barbara Kroll, editor
Cambridge University Press, 2003
 Buku Teks SO
Littlewood, William
Communicative language teaching : an introduction
Cambridge University Press, 1994
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Communicative language teaching : an introduction
Cambridge Uniiversity Press , 1983
 Buku Teks SO