Ur, P. (1988). Grammar practice activities: A practical guide for teachers. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoUr, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge: Cambridge University Press, 1988.
Deismireacht MLAUr, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge: Cambridge University Press, 1988.
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