Cita APA (7a ed.)

Ur, P. (1988). Grammar practice activities: A practical guide for teachers. University Press.

Cita Chicago Style (17a ed.)

Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge [etc.]: University Press, 1988.

Cita MLA (9a ed.)

Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. University Press, 1988.