1. International Museum of the Horse. What we theorize—when and where did domestication occur? Available at: http://imh.org/history-of-the-horse/legacy-of-the-horse/the-domestication-of-the-horse/what-we-theorize-when-and-where-did-domestication-occur.html. Accessed March 15, 2012.
2. Gemoll W. Hyginus gromaticus liber de munitionibus castrorum. 21:1879 Available at: http://archive.org/details/liberdemunitioni00hygiuoft. Accessed April 10, 2012.
3. Online Etymology Dictionary. Available at: http://www.etymonline.com/index.php?allowed_in_frame=0&search=farrier&searchmode=none. Accessed May 5, 2012.
4. The common law;Holmes,1881
5. Notes on the early history of the veterinary surgeon in England;Bullock;Proc R Soc Med,1929