1. Values in science and science education;Allchin,1988
2. Ethical implications of the human-animal bond on the farm;Anthony;Anim. Welf.,2003
3. APHA (American Paint Horse Association) Rulebook, 2010. Available at: http://www.apha.com/forms/PDFFiles/rulebooks/2010RuleBook.pdf p. 85.
4. ApHC (Appaloosa Horse Club) Rulebook, 2010. Available at: http://www.appaloosa.com/pdfs/rulebook10.pdf p. 30.
5. AQHA (American Quarter Horse Association) Rulebook, 2010. Available at: http://siteexec.aqha.com/association/registration/pdf/showrules_10.pdf pp. 121-123.