Ur, P. (1988). Grammar practice activities: A practical guide for teachers. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoUr, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge: Cambridge University Press, 1988.
MLA引文Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge: Cambridge University Press, 1988.
警告：这些引文格式不一定是100％准确.