Russell, Rhett. “Natural Horse Supply.” Training Common Since Horsemanship. Apr. 2008. 9/10/09href="http://naturalhorsesupply.com/training.stml">http://naturalhorsesupply.com/training.stml>.
http://www.equihorse.com/index.html
Delton, Mary, and Dickinson, Bob. "Bulding a Foundation You Can Ride On" 1898-2007. 2/9/09