Trask, R. L. (1997). The Penguin guide to punctuation. Penguin.
芝加哥风格引文Trask, R. L. The Penguin Guide to Punctuation. London: Penguin, 1997.
MLA引文Trask, R. L. The Penguin Guide to Punctuation. Penguin, 1997.
警告：这些引文格式不一定是100％准确.
APA引文