extra wordspacing before and after punctuation marks. The conventions are: One space follows sentence-ending punctuation mark (period, question mark, or
Truss, Lynne. Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation North American. Toronto: Gotham Books. 2003. ISBN 1592400876. . 查看维基词典中的词条「apostrophe」。
(原始内容存档于2020-08-05) (中文(臺灣)). Straus, Jane. Parentheses—Punctuation Rules. The Blue Book of Grammar and Punctuation. grammarbook.com. [18 April 2014]. (原始内容存档于2021-03-14)