Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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