Froehlich, D.J. (February 2002). “Quo vadis eohippus? The systematics and taxonomy of the early Eocene equids (Perissodactyla)”. Zoological Journal of the Linnean Society134 (2): 141–256. doi:10.1046/j.1096-3642.2002.00005.x.
Remy, Jean A.; Krasovec, Gabriel; Marandat, Bernard (2016). “A new species of Propalaeotherium (Palaeotheriidae, Perissodactyla, Mammalia) from the Middle Eocene locality of Aumelas (Hérault, France)”. Palaeovertebrata40 (2): e1. doi:10.18563/pv.40.2.e1.
Hay, Oliver P. (1915). "Contributions to the Knowledge of the Mammals of the Pleistocene of North America". Proceedings of the United States National Museum. 48 (2086): 535–549. doi:10.5479/si.00963801.48-2086.515
Aouraghe, Hassan (1999). “Les équidés du Pléstocène supérior de la grotte Zouhrah à El Harhoura, Maroc” (フランス語). Quaternaire10: 283–292. doi:10.3406/quate.1999.1649.
Eisenmann, Vera (March 2010). “Sussemionus, a new subgenus of Equus (Perissodactyla, Mammalia)”. Comptes Rendus Biologies333 (3): 235–240. doi:10.1016/j.crvi.2009.12.013. PMID20338542.
Eisenmann, Vera (March 2010). “Sussemionus, a new subgenus of Equus (Perissodactyla, Mammalia)”. Comptes Rendus Biologies333 (3): 235–240. doi:10.1016/j.crvi.2009.12.013. PMID20338542.