The Chicago Manual of Style (abbreviated in writing as CMS or CMOS [the version used on its website], or, by some writers as Chicago) is a style guide for American English published since 1906 by the University of Chicago Press. Its sixteen editions have prescribed writing and citation styles widely used in publishing. It is "one of the most widely used and respected style guides in the United States." CMOS deals with aspects of editorial practice, from American English grammar and use to document preparation.