As I’ve shared with you previously, my punctuation ‘bible’ is The Elements of Style by William Struck and E.B. White.
The same rules, with lots of entertaining examples and wonderful illustrations, can be found in this little tome: The New Well-Tempered Sentence: A Punctuation Handbook for the Innocent, the Eager and the Doomed by Karen Gordon.
The title says it all really. The book is hugely entertaining; there is certainly nothing dry or dull about this. Struck & White is a quick and crisp reference book, but Karen Gordon’s offering has totally original explanations of the rules of grammar, together with witty and whimsical illustrations. It is even peopled by a small cast of characters, which you wouldn’t usually expect in a grammar book.
Get hold of a copy if you can. It’s a riveting read!