John Clark, James R. Beerbower und Kenneth K. Kietzke: Oligocene sedimentation, stratigraphy, paleoecology and paleoclimatology in the Big Badlands of South Dakota. Fieldiana. Geology Memoirs 5, 1967, S. 1–158 ([1])
Oliver Perry Hay: Bibliography and catalogue of the fossil Vertebrata of North America. Bulletin of the U.S. Geological Survey 179, 1902, S. 1–868 (S. 675) ([2])
Edward Drinker Cope: Report on the stratigraphy and Pliocene vertebrate paleontology of northern Colorado. Bulletin of the U. S. Geological and Geographical Survey of the Territories 1 (1), 1874, S. 9–28 ([3])
Karl Alfred von Zittel: Handbuch der Palaeontologie. Abteilung I. Palaeozoologie. Band IV, Vertebrata (Mammalia). München, 1893, S. 1–799 (S. 361–362) ([4])
Joseph Leidy: On a new genus and species of Fossil Ruminantia, Poëbrotherium Wilsoni. Proceedings of the Academy of Natural Sciences of Philadelphia 3, 1847, S. 322–326 ([5])
Joseph Leidy: On a new genus and species of Fossil Ruminantia, Poëbrotherium Wilsoni. Annals and Magazine of Natural History 2 (1), 1848, S. 389–392 ([6])
Joseph Leidy: The ancient fauna of Nebraska: a description of remains of extinct mammalia and chelonia, from the Mauvaises Terres of Nebraska. Smithsonian contributions to knowledge 6, 1853, S. 1–126 (S. 19–23) ([7])
Joseph Leidy: The extinct mammalian fauna of Dakota and Nebraska. Journal of the Academy of Natural Sciences of Philadelphia 7 (20), 1869, S. 1–472 (S. 72–110) ([8])
Richard Lydekker: Catalogue of fossil Mammalia in the British Museum (Natural History). Part II. Containing the order Ungulata, suborder Artiodactyla. London, 1885, S. 1–324 (S. 149–150) ([9])
doi.org
Alessandro Zanazzi und Matthew J. Kohn: Ecology and physiology of White River mammals based on stable isotope ratios of teeth. Palaeogeography, Palaeoclimatology, Palaeoecology 257, 2008, S. 22–37, doi:10.1016/j.palaeo.2007.08.007
Eduardo Jiménez-Hidalgo, Krister T. Smith, Rosalia Guerrero-Arenas und Jesus Alvarado-Ortega: The first Late Eocene continental faunal assemblage from tropical North America. Journal of South American Earth Sciences 57, 2015, S. 39–48, doi:10.1016/j.jsames.2014.12.001
Gina M. Semprebon und Florent Rivals: Trends in the paleodietary habits of fossil camels from the Tertiary and Quaternary of North America. Palaeogeography, Palaeoclimatology, Palaeoecology 295, 2010, S. 131–145, doi:10.1016/j.palaeo.2010.05.033
google.de
books.google.de
Edward Drinker Cope: On the structure of the feet in the extinct Artiodactyla of North America. Proceedings of the American Association for the Advancement of Science 33, 1884, S. 482–489 ([11])
uchicago.edu
journals.uchicago.edu
Edward Drinker Cope: On the Origin of the Foot Structures of the Ungulates. The American Naturalist 15 (4), 1881, S. 269–273 ([10])