APA (7th ed.) Zitazioa

Ur, P. (2009). Grammar practice activities: A practical guide for teachers (Second edition.). Cambridge University Press.

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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