Waring, George H (2003). Horse Behavior (2nd ed.). New York: Noyes Publications/William Andrew Publishing. p. 9. ISBN978-0-8155-1484-8. Retrieved 6 June 2010.
Darwin, C. R. (ed. 1840). Fossil Mammalia Part 1 No. 4 of The zoology of the voyage of H.M.S. Beagle. By Richard Owen. London: Smith Elder and Co. p. 108–109
MacFadden, B. J. (1976). "Cladistic analysis of primitive equids with notes on other perissodactyls". Syst. Zool. 25 (1): 1–14. doi:10.2307/2412774. JSTOR2412774.
MacFadden, B. J. (1984). "Astrohippus and Dinohippus from the Yepómera local fauna (Hemphillian, Mexico) and implications for the phylogeny of one-toed horses". Journal of Vertebrate Paleontology. 4 (2): 273–283. Bibcode:1984JVPal...4..273M. doi:10.1080/02724634.1984.10012009.
Orlando, L.; Ginolhac, A.; Zhang, G.; Froese, D.; Albrechtsen, A.; Stiller, M.; Schubert, M.; Cappellini, E.; Petersen, B.; et al. (4 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.
Cai, Dawei; Zhuowei Tang; Lu Han; Camilla F. Speller; Dongya Y. Yang; Xiaolin Ma; Jian'en Cao; Hong Zhu; Hui Zhou (2009). "Ancient DNA provides new insights into the origin of the Chinese domestic horse". Journal of Archaeological Science. 36 (3): 835–842. Bibcode:2009JArSc..36..835C. doi:10.1016/j.jas.2008.11.006.
Orlando, L.; Ginolhac, A.L.; Zhang, G.; Froese, D.; Albrechtsen, A.; Stiller, M.; et al. (2013). "Recalibrating Equus evolution using the genome sequence of an early Middle Pleistocene horse". Nature. 499 (7456): 74–78. Bibcode:2013Natur.499...74O. doi:10.1038/nature12323. PMID23803765. S2CID4318227.
Zimov, S. A.; Chuprynin, V. I.; Oreshko, A. P.; Chapin, F. S.; Reynolds, J. F.; Chapin, M. C. (Nov 1995). "Steppe-tundra transition: a herbivore-driven biome shift at the end of the Pleistocene". The American Naturalist. 146 (5): 765–794. doi:10.1086/285824. JSTOR2462990. S2CID60439469.
MacFadden, B. J. (1984). "Systematics and phylogeny of Hipparion, Neohipparion, Nannippus, and Cormohipparion (Mammalia, Equidae) from the Miocene and Pliocene of the New World". Bulletin of the American Museum of Natural History. 179 (1): 1–195. hdl:2246/997.
MacFadden, B. J. (1984). "Astrohippus and Dinohippus from the Yepómera local fauna (Hemphillian, Mexico) and implications for the phylogeny of one-toed horses". Journal of Vertebrate Paleontology. 4 (2): 273–283. Bibcode:1984JVPal...4..273M. doi:10.1080/02724634.1984.10012009.
Orlando, L.; Ginolhac, A.; Zhang, G.; Froese, D.; Albrechtsen, A.; Stiller, M.; Schubert, M.; Cappellini, E.; Petersen, B.; et al. (4 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.
Cai, Dawei; Zhuowei Tang; Lu Han; Camilla F. Speller; Dongya Y. Yang; Xiaolin Ma; Jian'en Cao; Hong Zhu; Hui Zhou (2009). "Ancient DNA provides new insights into the origin of the Chinese domestic horse". Journal of Archaeological Science. 36 (3): 835–842. Bibcode:2009JArSc..36..835C. doi:10.1016/j.jas.2008.11.006.
Orlando, L.; Ginolhac, A.L.; Zhang, G.; Froese, D.; Albrechtsen, A.; Stiller, M.; et al. (2013). "Recalibrating Equus evolution using the genome sequence of an early Middle Pleistocene horse". Nature. 499 (7456): 74–78. Bibcode:2013Natur.499...74O. doi:10.1038/nature12323. PMID23803765. S2CID4318227.
MacFadden, B. J. (1976). "Cladistic analysis of primitive equids with notes on other perissodactyls". Syst. Zool. 25 (1): 1–14. doi:10.2307/2412774. JSTOR2412774.
Zimov, S. A.; Chuprynin, V. I.; Oreshko, A. P.; Chapin, F. S.; Reynolds, J. F.; Chapin, M. C. (Nov 1995). "Steppe-tundra transition: a herbivore-driven biome shift at the end of the Pleistocene". The American Naturalist. 146 (5): 765–794. doi:10.1086/285824. JSTOR2462990. S2CID60439469.
Orlando, L.; Ginolhac, A.; Zhang, G.; Froese, D.; Albrechtsen, A.; Stiller, M.; Schubert, M.; Cappellini, E.; Petersen, B.; et al. (4 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.
Orlando, L.; Ginolhac, A.; Zhang, G.; Froese, D.; Albrechtsen, A.; Stiller, M.; Schubert, M.; Cappellini, E.; Petersen, B.; et al. (4 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.
Zimov, S. A.; Chuprynin, V. I.; Oreshko, A. P.; Chapin, F. S.; Reynolds, J. F.; Chapin, M. C. (Nov 1995). "Steppe-tundra transition: a herbivore-driven biome shift at the end of the Pleistocene". The American Naturalist. 146 (5): 765–794. doi:10.1086/285824. JSTOR2462990. S2CID60439469.