Trask, R. L. (1997). The Penguin guide to punctuation. Penguin.
Chicago Style (17th ed.) CitationTrask, 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:這些引文格式不一定是100%准確.