The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- Groves, C. P., and Catherine H. Bell. 2004. New investigations on the taxonomy of the zebras genus Equus, subgenus Hippotigris. Mammalian Biology, vol. 69, no. 3. 182-196
- Groves, Colin, and Peter Grubb. 2011. Ungulate Taxonomy. ix + 317
- M. F. Skinner and C. W. Hibbard. 1972. Early Pleistocene pre-glacial and glacial rocks and faunas of north-central Nebraska. Bulletin of the American Museum of Natural History 148(1):1-148
- Wilson, Don E., and DeeAnn M. Reeder, eds. 2005. Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., vols. 1 & 2. 2000
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