Ur, P. (1996). Grammar practice activities: A practical guide for teachers. Cambridge University Press.
芝加哥风格引文Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge ; New York: Cambridge University Press, 1996.
MLA引文Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge University Press, 1996.
警告：这些引文格式不一定是100％准确.