Nam, Yong Sin, 1948-
Na ui hangugo baro ssugi notu
Kkochi , 2010
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Byon, Andrew Sangpil
Basic korean : a grammar and workbook
Routledge, Taylor & Francis Group, 2009
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Hewings, Martin
Advanced grammar in Use : a self-study reference and practice book for advanced studentss of english with answers
Cambridge University Press, 2006
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Muhibbin Syah
Cara mudah menerapkan Engglish grammar : kaidah & pelatihan untuk rujukan belajar sendiri
RajaGrafindo Persada, 2010
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Dean, Howard H.
Effective communication : a guide to reading, writing, speaking and listening
Prentice-Hall, 1962
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