1. Extinction of avoidance responding through response prevention (flooding);Baum;Psych. Bull,1970
2. The BHS manual of equitation,2001
3. A fluoroscopic study of the position and action of different bits in the horse's mouth;Clayton;J. Equine Vet. Sci,1985
4. Denoix, J.M., 2006. Functional anatomy and diagnostic imaging of the cervical spine. In: Report of the FEI Veterinary and Dressage Committee's Workshop. The use of over-bending (‘Rollkur') in FEI Competition. FEI Veterinary Committee meeting at the Olympic Museum, 31 January, Lausanne, Switzerland.
5. The horse in Blackfoot Indian culture—with comparative material from other western tribes. Bureau of American Ethnology (Bulletin 159, 62), Smithsonian Institution;Ewers,1955