1. Ancient Greek Horsemanship;Anderson,1961
2. A Natural History of Domesticated Mammals;Clutton-Brock,1999
3. The Horse in the Furrow;Evans,1960
4. The horse in Blackfoot Indian culture;Ewers;Smithsonian Institute Bureau of American Ethnology Bulletin,1955
5. Grooming at a preferred site reduces heart rate in horses;Feh;Animal Behaviour,1993