Trask, R. L. 1. (1997). The Penguin guide to punctuation. London ; New York: Penguin.
Trích dẫn kiểu ChicagoTrask, R. L. 1944-. The Penguin Guide to Punctuation. London ; New York: Penguin, 1997.
MLA引文Trask, R. L. 1944-. The Penguin Guide to Punctuation. London ; New York: Penguin, 1997.
警告：这些引文格式不一定是100％准确.