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The Blue Book of Grammar and Punctuation

Punctuation Rules

Punctuation is the system that organizes our thoughts and ideas in our writing. Applied correctly, punctuation can guide and deliver our expressions with impact and clarity. Applied incorrectly, it can confuse our audience and distract from our intended effect.

Proper punctuation is vital to writing in American English. Our punctuation rules help you establish the proper framework for conveying your messages. Choose your topic from the list below.


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Note: Some punctuation usage rules vary among authorities. For example, the Associated Press (AP) Stylebook is a guide specific for news media and journalists while The Chicago Manual of Style (CMS) is used by many book publishers and writers. The Blue Book of Grammar and Punctuation leans towards usage rules in CMS along with other authoritative texts and does not attempt to conform to the AP Stylebook, which differs significantly in some aspects.