Citazione Stile APA (7a Edizione)

Ur, P., & Swan, M. (2009). Grammar Practice Activities. A practical guide for teachers (Second edition.). Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Ur, Penny, e Michael Swan. Grammar Practice Activities. A Practical Guide for Teachers. Second edition. Cambridge, United Kingdom: Cambridge University Press, 2009.

Citatione MLA (9a ed.)

Ur, Penny, e Michael Swan. Grammar Practice Activities. A Practical Guide for Teachers. Second edition. Cambridge University Press, 2009.