Walker, E., & Elsworth, S. (1994). Grammar practice for intermediate students: With answer key. Burnt Mill: Longman.
Trích dẫn kiểu ChicagoWalker, E., và S. Elsworth. Grammar Practice for Intermediate Students: With Answer Key. Burnt Mill: Longman, 1994.
MLA citiranjeWalker, E., và S. Elsworth. Grammar Practice for Intermediate Students: With Answer Key. Burnt Mill: Longman, 1994.
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