APA

Ur P., . (2006). Grammar Practice Activities. A practical guide for teachers. Cambridge: Cambridge University Press.

Chicago

Ur P, . 2006. Grammar Practice Activities. A practical guide for teachers. Cambridge: Cambridge University Press.

Harvard

Ur P., . (2006). Grammar Practice Activities. A practical guide for teachers. Cambridge: Cambridge University Press.

MLA

Ur P, . Grammar Practice Activities. A practical guide for teachers. Cambridge: Cambridge University Press. 2006.