There are many books and other resources, designed specially for writers. Some are brilliant, and some not so good. Here is a list that I have found useful over the years and would gladly recommend to any writer.

This list is far from exhaustive. If you think there is something missing off this list, then let me know. 

Books for Editing

New Oxford Style Manual
The Chicago Manual of Style, 16th Edition
Chicago Manual Of Style Guidelines (Quick Study)
Story Fix: Transform Your Novel from Broken to Brilliant
Elements of Style
Concise Oxford English Dictionary: Main edition
Oxford Thesaurus of English.
Merriam-Webster’s Collegiate Dictionary
Merriam-Webster’s Collegiate Thesaurus, Second Edition
Bryson’s Dictionary of Troublesome Words