If you want a dense, comprehensive writing and style guide, the Bedford Handbook may be what you're looking for. It's the most portable (yet helpful) style guide I've come across in my quest for a style guide to end all style guides (which I have not yet found!).

It covers all those gotchas of the English language, ranging from punctuation, grammar, formatting, and even proper citations (in all the major association formats).

Definitely a good guide for those interested in honing their skills in writing, especially those who face trouble in areas of grammar and punctuation. ( )