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"The Natural Horse and Unnatural Behaviour."Arkiveret 8. marts 2012 hos Wayback Machine Reproduced with permission from the Proceedings of the BEVA Specialist Days on Behaviour and Nutrition. by P.A.Harris et al. (editor), Equine Veterinary Journal Ltd. Hentet 22. juni 2007.
"The Natural Horse and Unnatural Behaviour."Arkiveret 8. marts 2012 hos Wayback Machine Reproduced with permission from the Proceedings of the BEVA Specialist Days on Behaviour and Nutrition. by P.A.Harris et al. (editor), Equine Veterinary Journal Ltd. Hentet 22. juni 2007.
Ensminger, pp. 46–50 Ensminger, M. E. (1990). Horses and Horsemanship: Animal Agricultural Series (Sixth udgave). Danville, IN: Interstate Publishers. ISBN0-8134-2883-1. OCLC21977751.
Ensminger, p. 156 Ensminger, M. E. (1990). Horses and Horsemanship: Animal Agricultural Series (Sixth udgave). Danville, IN: Interstate Publishers. ISBN0-8134-2883-1. OCLC21977751.
Ensminger, p. 150 Ensminger, M. E. (1990). Horses and Horsemanship: Animal Agricultural Series (Sixth udgave). Danville, IN: Interstate Publishers. ISBN0-8134-2883-1. OCLC21977751.
