Gower, R. (2005). Grammar in practice 4 (First edition.). Cambridge University Press.
芝加哥风格引文Gower, Roger. Grammar in Practice 4. First edition. Cambridge: Cambridge University Press, 2005.
MLA引文Gower, Roger. Grammar in Practice 4. First edition. Cambridge University Press, 2005.
警告：这些引文格式不一定是100％准确.