Hopkins, Diana
Cambridge grammar for ielts with answers: self-study grammar reference and practice
Cambridge University Press, 2011
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Cullen, Pauline
Cambridge vocabulary for IELTS
Cambridge University Press, 2008
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Cambridge IELTS 6 : examination papers from University of Cambridge ESOL examinations
Cambridge University Press, 2007
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Cambridge IELTS 6 : examination papers from University of Cambridge ESOL examinations
Cambridge University Press, 2007
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Cambridge IELTS 7 : examination papers from University of Cambridge ESOL examinations
Cambridge University Press, 2009
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