"On Your Toes". American Museum of Natural History. Retrieved September 14, 2013.
archive-it.org
wayback.archive-it.org
Clayton, Hilary (October 2007). "Components of Collection"(PDF). Dressage Today. Archived from the original(PDF) on February 13, 2013. Retrieved September 15, 2013.
Hunt, Kathleen. "Horse Evolution"(PDF). Carnegie Mellon University. p. 7. Archived from the original(PDF) on August 5, 2013. Retrieved September 15, 2013.
Loving, Nancy S. (March 6, 2008). "Shoe Boils". HorseChannel. Retrieved February 20, 2013.
msu.edu
cvm.msu.edu
Clayton, Hilary (October 2007). "Components of Collection"(PDF). Dressage Today. Archived from the original(PDF) on February 13, 2013. Retrieved September 15, 2013.
Ferraro, Gregory L.; Stover, Susan M.; Whitcomb, Mary Beth. "Suspensory Ligament Injuries in Horses"(PDF). Davis: University of California. pp. 6–7. Archived from the original(PDF) on July 31, 2009. Retrieved September 16, 2013.
unr.edu
unce.unr.edu
Hansen, D. Karen; Schafer, Stephen R. (2007). "Horse Gaits"(Powerpoint). University of Nevada, Reno. Retrieved September 17, 2013.
usdf.org
"Half Halt"(PDF). United States Dressage Federation. Retrieved September 17, 2013.
Hunt, Kathleen. "Horse Evolution"(PDF). Carnegie Mellon University. p. 7. Archived from the original(PDF) on August 5, 2013. Retrieved September 15, 2013.
Ferraro, Gregory L.; Stover, Susan M.; Whitcomb, Mary Beth. "Suspensory Ligament Injuries in Horses"(PDF). Davis: University of California. pp. 6–7. Archived from the original(PDF) on July 31, 2009. Retrieved September 16, 2013.