APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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