I'll add a list of good reference books here.
The Human Figure John H Vanderpoel
An Atlas of Animal anatomy for Artists W.Ellenberger, H Baum and H Dittrich
Human Anatomy for Artists Eliot Goldfinger
Animal Anatomy for Artists
Atlas of Human Anatomy for the Artist Stephen Rodgers Peck
Modelling and Sculpting the Human Figure Edouard Lanteri
Modelling and Sculpting Animals Edouard Lanteri
