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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.
