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Orlando L, Ginolhac A, Zhang G, Froese D, Albrechtsen A, Stiller M, et al. (July 2013). "Recalibrating Equus evolution using the genome sequence of an early Middle Pleistocene horse". Nature. 499 (7456): 74–8. Bibcode:2013Natur.499...74O. doi:10.1038/nature12323. PMID23803765. S2CID4318227.
Eisenmann, Véra (March 2010). "Sussemionus, a new subgenus of Equus (Perissodactyla, Mammalia)". Comptes Rendus Biologies. 333 (3): 235–240. doi:10.1016/j.crvi.2009.12.013. PMID20338542.
Orlando L, Ginolhac A, Zhang G, Froese D, Albrechtsen A, Stiller M, et al. (July 2013). "Recalibrating Equus evolution using the genome sequence of an early Middle Pleistocene horse". Nature. 499 (7456): 74–8. Bibcode:2013Natur.499...74O. doi:10.1038/nature12323. PMID23803765. S2CID4318227.
"Pryor Mountains Wild Horse Range". Billings Field Office . Bureau of Land Management. U.S. Department of the Interior. May 2, 2011. Archived from the original on June 16, 2015. Retrieved 2011-05-27.