Wren, W., & Lindsay, S. (2019). Cambridge Grammar And Writing Skills Learner's Book 6 (1st.). Cambridge University Press.
芝加哥风格引文Wren, Wendy, 与 Sarah Lindsay. Cambridge Grammar And Writing Skills Learner's Book 6. 1st. UK: Cambridge University Press, 2019.
MLA引文Wren, Wendy, 与 Sarah Lindsay. Cambridge Grammar And Writing Skills Learner's Book 6. 1st. Cambridge University Press, 2019.
警告：这些引文格式不一定是100％准确.