hands down the best book you can read as a creative. I re read it recently and it has every golden nugget of advice I've gotten through my 8 years of art school plus the gems I learned in my creative career.
Steal Like an Artist: 10 Things About Being Creative
WONDERFUL resource for pricing, but it also has templates for invoices, contracts, etc. Used it for every major project in my professional career.
Graphic Artists Guild Handbook, 16th Edition
I bought this book because on the back it said there was magic in it, and it was so good I forgot about the magic until it was introduced mid story. Beautiful stuff.
My Favorite Graphic Novel - Snapdragon
For inkers and illustrators! Practice your skills :)