APA

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

Chicago

Penny Ur, . 1988. Grammar practice activities: A practical guide for teachers. : Cambridge University Press, Cambridge.

Harvard

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

MLA

Penny Ur, . Grammar practice activities: A practical guide for teachers. : Cambridge University Press, Cambridge. 1988.