

Grammar enthusiasts celebrate “Chicago style” rules, such as whether to put the title of a book in italics (Chicago style says yes, whereas AP style recommends quotation marks), or whether to use a serial comma-also known as an “Oxford” comma (Chicago style: yes AP style: no). A free Chicago style Q&A and other resources are also available to the public on the CMOS website. Sometimes referred to by its acronym, CMOS (pronounced like “sea moss”), The Chicago Manual of Style is available both in print and online, for an annual subscription fee. The Manual is now in its 17th edition, published in 2017. (Other style guides are published by professional associations.) Eventually, the Manual became a canonical work synonymous with its home institution, akin to the Oxford English Dictionary. The Chicago Manual of Style has become a staple reference for writers and editors, in part because it was one of the first style guides to be published in book form, and the only one from an academic press in North America.

Today, it is used widely in many academic disciplines and is considered the standard for US style in book publishing. The Chicago Manual of Style is an American English style and usage guide published continuously by the University of Chicago Press since 1906.
