Ur, P., & Swan, M. (2009). Grammar Practice Activities. A practical guide for teachers (Second edition.). Cambridge University Press.
Citace podle Chicago (17th ed.)Ur, Penny, a Michael Swan. Grammar Practice Activities. A Practical Guide for Teachers. Second edition. Cambridge, United Kingdom: Cambridge University Press, 2009.
Citace podle MLA (9th ed.)Ur, Penny, a Michael Swan. Grammar Practice Activities. A Practical Guide for Teachers. Second edition. Cambridge University Press, 2009.
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