1. Howard L.L Allen J.L. Zuba J.R.et al. (2004).Management of enterolithiasis in a Somali wild ass (Equus africanus somalicus) at the San Diego Wild Animal Park.Proceedings of the American Association of Zoo Veterinarians.
2. CLINICAL DISEASE ASSOCIATED WITH ANAPLASMA PHAGOCYTOPHILUM INFECTION IN CAPTIVE PRZEWALSKI'S HORSES (EQUUS FERUS PRZEWALSKII)
3. Vercammen F. DeDeken R. andBrandt J.(2003).Salmonellosis and exungulation in a Przewalski horse (Equus Przewalskii).Proceedings of the American Association of Zoo Veterinarians.
4. Equidae
5. Nondomestic Equids