The Chicago Manual of Style

The Chicago Manual of Style (CMS or Chicago) is a style guide for American English writing issued by the University of Chicago Press.CMS discuss all aspects of editorial practice, from American English grammar and usage to document preparation.

The first edition of this book is published by the University of Chicago in 1906, under the title A Manual of Style. On publication of the 13 in 1982, the book officially changed its name to The Chicago Manual of Style, which have previously been widely used unofficially by the users of this book. In recent years, the publisher has issued a new edition about every decade. (The 14th edition of this book was published in 1993.) Most recent edition, the 15th edition, published in 2003.
CMS is currently published in a hardcover edition and CD-ROM, accompanied by an online edition was published on September 29, 2006 (link). Online edition of this book includes the text fully searchable on the internet from the edition of 15, with Additional features include tools for editors, guidelines excerpted quickly, and access can be searched to the Chicago Style Q & A, a view that is popular among the editors of manuscripts and grammar addict.

Source : www.wikipedia.com