Becker, J. J.
1985. Fossil herons (Aves: Ardeidae) of the late Miocene and early Pliocene of Florida. Journal of Vertebrate Paleontology, 5:24–31.
Berta, A., and Morgan, G. S.
1985. A new sea otter (Carnivora: Mustelidae) from the late Miocene and early Pliocene (Hemphillian) of North America. Journal of Paleontology, 59:809–819.
Bode, F. D.
1931. Characters useful in determining the position of individual teeth in the permanent cheektooth series of merychippine horses. Journal of Mammalogy, 12:118–129.
Churcher, C. S., and Richardson, M. L.
1978. Equidae, p. 379–422. In
Maglio, V. J. and Cooke, H. B. S. (eds.), Evolution of African Mammals. Harvard University Press, Cambridge, Massachusetts.
Cope, E. D.
1889. A review of the North American species of Hippotherium
. Proceedings of the American Philosophical Society,
Cope, E. D.
1893. A preliminary report on the vertebrate paleontology of the Llano Estacado. 4th Annual Report, Geological Survey of Texas, 136 p.
Dalquest, W. W.
Hesperohipparion (Mammalia, Equidae), a new genus of horse from the Hemphillian of North America, with a description of a new species. Southwestern Naturalist,
Edwards, S. W.
1982. A new species of Hipparion (Mammalia: Equidae) from the Clarendonian (Miocene) of California. Journal of Vertebrate Paleontology,
1979. Cladism and common sense, p. 165–198. In
Cracraft, J. and Eldredge, N. (eds.), Phylogenetic Analysis and Paleontology. Columbia University Press, New York.
1975. The fossil horses of the Texas Gulf Coastal Plain: a revision. Texas Memorial Museum, Pierce-Sellards series, 22:1–86.
1982. The status of the genus Cormohipparion Skinner and MacFadden (Mammalia, Equidae). Journal of Paleontology,
1984. Supraspecific groups of Old World hipparions (Mammalia, Equidae). Paläontologische Zeitschrift,
Gidley, J. W.
1903. A new three-toed horse. Bulletin of the American Museum of Natural History, 19:465–476.
Gray, J. E.
1821. On the natural arrangement of vertebrose animals. London Medical Repository Review, 15:296–310.
Hirschfeld, S. E., and Webb, S. D.
1968. Plio-Pleistocene megalonychid sloths of North America. Bulletin of the Florida State Museum, 12:213–296.
Hulbert, R. C.
1982. Population dynamics of the three-toed horse Neohipparion from the late Miocene of Florida. Paleobiology,
1869. The extinct mammalian fauna of Dakota and Nebraska. Journa. of the Academy of Natural Sciences, Philadelphia, series 2, 7:1–472.
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,
McGrew, P. O.
1938. The Burge fauna, a lower Pliocene mammalian assemblage from Nebraska. Bulletin of the Department of Geological Sciences, University of California,
Merriam, J. C.
1915. New species of the Hipparion group from the Pacific Coast and Great Basin provinces of North America. Bulletin of the Department of Geology, University of California,
Osborn, H. F.
1918. Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision. Memoirs of the American Museum of Natural History, New Series,
1848. Description of teeth and portions of jaws of two extinct anthracotheroid quadrapeds (Hyopotamus vectianus and H. bovinus) discovered by the Marchioness of Hastings in the Eocene deposits on the N.W. Coast of the Isle of Wight, with an attempt to develope Cuvier's idea of the classification of pachyderms by the number of their toes. Quarterly Journal of the Geological Society o. London, 4:104–141.
Qui, Z., Huang, W., and Kuo, Z.
1980. Notes on the first discovery of the skull of Hipparion houfenense
. Vertebrata Palasiatica,
18:131–137. (In Chinese, English summary.)
Quinn, J. H.
1955. Miocene Equidae of the Texas Gulf Coastal Plain. Bureau of Economic Geology, University of Texas Publication No. 5516, 102 p.
Simpson, G. G.
1930. Tertiary land mammals of Florida. Bulletin of the American Museum of Natural History, 59:149–211.
Skinner, M. F., and Johnson, F. W.
1984. Tertiary stratigraphy and the Frick collection of fossil vertebrates from north-central Nebraska. Bulletin of the American Museum of Natural History, 178:215–368.
Skinner, M. F. and MacFadden, B. J.
Cormohipparion n. gen. (Mammalia, Equidae) from the North American Miocene (Barstovian, Clarendonian). Journal of Paleontology,
Skinner, M. F. and Taylor, B. E.
1967. A revision of the geology and paleontology of the Bijou Hills, South Dakota. American Museum Novitates,
Stirton, R. A.
1940. Phylogeny of North American Equidae. Bulletin of the Department of Geological Sciences, University of California, 25:165–198.
Stirton, R. A.
1952. Are Petuluma horse teeth reliable in correlation?
Bulletin of the American Association of Petroleum Geologists, 36:2011–2025.
Stirton, R. A.
1955. Two new species of the equid genus Neohipparion from the middle Pliocene, Chihuahua, Mexico. Journal of Paleontology,
Tedford, R. H., and Hunter, M. E.
1985. Miocene marine–nonmarine correlations, Atlantic and Gulf Coastal Plains, North America. Palaeogeography, Palaeoclimatology, Palaeoecology,
Tedford, R. H., et al. In press. Faunal succession and biochronology of the Arikareean through Hemphillian interval (late Oligocene through earliest Pliocene Epochs), North America. In
Woodburne, M. O. (ed.), Cenozoic Mammals of North America: Geochronology and Biostratigraphy. University of California Press, Berkeley.
dWebb, S. D., 1969a. The Burge and Minnechaduza Clarendonian mammalian faunas of north-central Nebraska. University of California Publications in Geological Sciences, 78:1–191.
Webb, S. D.
1969b. The Pliocene Canidae of Florida. Bulletin of the Florida State Museum, 14:273–308.
Webb, S. D. and Hulbert, R. C.
1986. Systematics and evolution of Pseudhipparion (Mammalia, Equidae) from the Late Neogene of the Gulf Coastal Plain and the Great Plains, p. 237–272. In
Flanagan, K. and Lilligraven, J. A. (eds.), Vertebrates, Phylogeny, and Philosophy. University of Wyoming Press, Laramie.
Webb, S. D.
MacFadden, B. J., and Baskin, J. A.
1981. Geology and paleontology of the Love Bone Bed from the late Miocene of Florida. American Journal of Science, 281:513–544.
Zhegallo, V. I.
1978. Gipparioni zentralnoi Asii. Trudy Sovmestnaya Sovetsko-Mongol'skaya Paleontologicheskaya Ekspeditsiya, 7:1–156.