As a mostly self-taught artist I adore books; they have been my first teachers.
I have read a good many books on the various different aspects of making art, some better than others.
Here's a list of some of my personal favorites, books I would recommend to my fellow artists.
I'm linking to them on Amazon.com, not to endorse their services but to enable you to read their descriptions, reviews and get an idea for their prices.
"Anatomy Drawing School: Human, Animal, Comparative Anatomy" by Andras Szunyoghy and Gyorgy Feher
"Dynamic Figure Drawing" by Burne Hogarth
"Drawing the Human Head" by Burne Hogarth
"Drawing Dynamic Hands" by Burne Hogarth
"The Book of a Hundred Hands" by George B. Bridgman
"Force: Dynamic Life Drawing for Animators" by Mike Mattesi
"The Art of Animal Drawing: Construction, Action Analysis, Caricature" by Ken Hultgren
"How to Draw Animals" by Jack Hamm
"Secrets to Drawing Heads" by Allan Kraayvanger
"The New Drawing on the Right Side of the Brain" by Betty Edwards
"Drawing on the Artist Within: An Inspirational and Practical Guide to Increasing Your Creative Powers" by Betty Edwards
"Animals in Motion" by Eadweard Muybridge
"Dynamic Light and Shade" by Burne Hogarth
"Color and Light: A Guide for the Realist Painter" by James Gurney
"Perspective Without Pain" by Phil Metzger