Citazione Stile APA (7a Edizione)

Ur, P. (1996). Grammar practice activities: A practical guide for teachers. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge ; New York: Cambridge University Press, 1996.

Citatione MLA (8a ed.)

Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge University Press, 1996.