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BC Chalker, Sylvia. A student's english grammar workbook / Sylvia Chalker . - [1st. ed., 4th impr.] Essex : Longman, 1996
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BC Hewings, Martin. Advanced grammar in use : a self-study reference and practice book for advanced learners of English : with answers / Martin Hewings . - 2nd ed., 7th print. Cambridge : Cambridge University Press, 2009