Groves, C. P.; Bell, C. H. (2004). "New investigations on the taxonomy of the zebras genus Equus, subgenus Hippotigris". Mammalian Biology - Zeitschrift für Säugetierkunde. 69 (3): 182. Bibcode:2004MamBi..69..182G. doi:10.1078/1616-5047-00133.
Groves, C. P.; Bell, C. H. (2004). "New investigations on the taxonomy of the zebras genus Equus, subgenus Hippotigris". Mammalian Biology - Zeitschrift für Säugetierkunde. 69 (3): 182. Bibcode:2004MamBi..69..182G. doi:10.1078/1616-5047-00133.