Ur, P. (2009). Grammar practice activities: A practical guide for teachers (Second edition.). Cambridge University Press.
Chicagoスタイル(17版)引用形式Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Second edition. Cambridge: Cambridge University Press, 2009.
MLA(9版)引用形式Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Second edition. Cambridge University Press, 2009.
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