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
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Exploring the dynamics of second language writing
Barbara Kroll, editor
Cambridge University Press, 2003
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Littlewood, William
Communicative language teaching : an introduction
Cambridge Uniiversity Press , 1983
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Communicative language teaching : an introduction
Cambridge University Press, 1994
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