There's a lot of different books out there.
I might as well mention Paul Herd's book before someone else does.... It's OK as long as you realize it has some very basic flaws (like bird decal placement) that make the book questionable. Still... there's some good info and a lot of pictures. Good to have, just don't hang your hat on the information without double checking. There's also a Charger resto guide called "Project Charger" that shows some good tech... just don't glue a patch panel on like they did.
The factory service manual (FSM) is very good and is available in our reference section. Download a copy (saves time when you want it fast) and print the pages out as needed. Download a copy of the parts manual too. There's a lot of very good illustrations and info right there.