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Kentucky Horse Park. «American Quarter Horse». International Museum of the Horse- Horse Breeds of the World. Kentucky Horse Park. [Consulta: 11 juny 2008].
nfqha.com
National Foundation Quarter Horse Association. «National Foundation Quarter Horse Association». NFQHA Website. National Foundation Quarter Horse Association. [Consulta: 2 abril 2007].
okstate.edu
ansi.okstate.edu
Oklahoma State University. «Quarter Horse». Breeds of Livestock. Oklahoma State University. [Consulta: 11 juny 2008].
Beckmann, Bruce. «Quarter Horses». Handbook of Texas Online. Texas State Historical Association. [Consulta: 30 maig 2006].[Enllaç no actiu]
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American Quarter Horse Association. «AQHA Handbook of Rules and Regulations». SECTION II, Registration Rules and Regulations. American Quarter Horse Association. Arxivat de l'original el 2008-08-13. [Consulta: 7 desembre 2010].