Collins. (2013). Work on your grammar (Upper Intermediate B2): Over 200 exercises to improve your English grammar. Tổng hợp.
Styl ChicagoCollins. Work On Your Grammar (Upper Intermediate B2): Over 200 Exercises to Improve Your English Grammar. Tổng hợp, 2013.
Citace podle MLACollins. Work On Your Grammar (Upper Intermediate B2): Over 200 Exercises to Improve Your English Grammar. Tổng hợp, 2013.
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