The Chicago Manual of Style Description:

The Chicago Manual of Style review:
5 stars (Comprehensive resource) - I am currently using my Chicago Manual of Style for law journal editing. It's a great comprehensive resource for style, grammar and usage. I don't know what I would do without it!
5 stars (Solid) - There are a number of style manuals out there. This one is no-nonsense, authoritative, and well-respected. If you want to learn to sharpen your writing and language skills, it would serve you well to study this text and keep it handy for reference.
5 stars (usefulness without end) - Keeping a copy of the 15th edition of the Chicago Manual of Style nearby is like having a friend to consult over matters of writing style. Whether or not one intends to abide by "the rules", it is certainly useful to have ready access to them.