Hewings, Martin
Advanced grammar in use : a reference and practice book for advanced students of english
Cambridge University Press, 2005
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Some grammatical errors made by the students of Unpam
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McCarthy, Michael
English vocabulary in use : upper-intermediate & advanced
Erlangga, 2002
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Puchta, Herbert
English in mind: student book 5
Cambridge University Press, 2012
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Puchta, Herbert
English in mind : student book 4 / Herbert Puchta, Jeff Stranks, Peter Lewis-Jones
Cambridge University Press, 2014
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