I have decided to include here a list of books that I've found very helpful over the years as an artist and writer. This is by no means a definitive list of helpful books on the subjects, but they are ones that I have read and enjoyed. They include:
Drawing on the Right Side of the Brain, Betty Edwards
The Artist's Way: A Spiritual Path to Higher Creativity, Julia Cameron
Making Comics: Storytelling Secrets of Comics, Manga, and Graphic Novels, Scott McCloud
How to Make Webcomics, Brad Guigar, Dave Kellett, Scott Kurtz, and Kris Straub
How to Draw Noir Comics: The art and technique of visual storytelling, Shawn Martinbrough
Dynamic Figure Drawing, Burne Hogarth
Dynamic Light and Shade, Burne Hogarth
Dynamic Wrinkles and Drapery, Burne Hogarth
Drawing Dynamic Hands, Burne Hogarth
Anatomy and Drawing, Victor Perard
How to Draw Manga: Illustrating Battles, Hikaru Hayashi
Vanishing Point: Perspective for Comics from the Ground Up, Jason Cheeseman-Meyer
The Comic Artist's Photo Reference Collections, Buddy Scalera
The DC Comic's Guide to Writing Comics, Dennis O'Neil
Alan Moore's Writing for Comics, Alan Moore
Invisible Ink: A practical guide to building stories that resonate, Brian McDonald
Save the Cat! The last book on screenwriting you'll ever need, Blake Snyder