This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
M. Spaulding, 2009 - Relationships of Cetacea (Artiodactyla) among mammals: Increased taxon sampling alters interpretations of key fossils and character evolution - PloS One (4), e7062- (journal article, English)
A. R. Tabrum, 2007 - Pipestoneia douglassi, A New Genus and Species of Selenodont Artiodactyl from the Pipestone Springs Area, Jefferson County, Montana - Bulletin of Carnegie Museum of Natural History (39), 83-96 (journal article, English)
J. Alroy, 2002 - Synonymies and reidentifications of North American fossil mammals - (), - (unpublished, English)
W. W. Korth, 2002 - Review of Leptomeryx (Artiodactyla, Leptomerycidae) from the Orellan (Oligocene) of Nebraska - Annals of Carnegie Museum (71), 107-129 (journal article, English)
I. A. Vislobokova, 2001 - Evolution and classification of Tragulina (Ruminantia, Artiodactyla) - Paleontological Journal (Suppl. 2), S69-S145 (journal article, English)
M. W. Webb, 1998 - New Saxonellidae, Plagiomenidae, and Pantolestidae from the late Paleocene of central Alberta, Canada - Journal of Vertebrate Paleontology (18), 84A-85A (abstract, English)
D. R. Prothero, 1996 - Camelidae - The Terrestrial Eocene-Oligocene Transition in North America (), 609-651 (book/book chapter, English)
R. J. Emry, 1981 - The Hornless Protoceratid Pseudoprotoceras (Tylopoda: Artiodactyla) in the Early Oligocene of Saskatchewan and Wyoming - Journal of Vertebrate Paleontology (1), 101-110 (journal article, English)
C. C. Black, 1978 - Paleontology and Geology of the Badwater Creek Area, Central Wyoming. Part 14. The Artiodactyls - Annals of Carnegie Museum (47), 223-259 (journal article, English)
B. E. Taylor, 1976 - Miocene Leptomerycidae (Artiodactyla, Ruminantia) and their relationships - American Museum Novitates (2596), - (journal article, English)
J. A. Wilson, 1974 - Early Tertiary Vertebrate Faunas, Vieja Group and Buck Hill Group, Trans-Pecos Texas: Protoceratidae, Camelidae, Hypertragulidae - Bulletin of the Texas Memorial Museum (23), 1-24 (journal article, English)
C. L. Gazin, 1956 - The Geology and Vertebrate Paleontology of Upper Eocene Strata in the Northeastern Part of the Wind River Basin, Wyoming. Part 2. the Mammalian Fauna of The Badwater Area - Smithsonian Miscellaneous Collections (131), 1-44 (journal article, English)
C. Stock, 1949 - Mammalian Fauna from Titus Canyon Formation, California - Carnegie Institution of Washington Publication (584), 229-244 (journal article, English)
W. B. Scott, 1940 - The mammalian fauna of the White River Oligocene; Part 4, Artiodactyla; Part 5, Perissodactyla - Transactions of the American Philosophical Society (28), 363-746 (journal article, )
H. E. Koerner, 1940 - New vertebrates Part 1 of The geology and vertebrate paleontology of the Fort Logan and Deep River formations of Montana - American Journal of Science (238), 837-862 (journal article, English)
C. Frick, 1937 - Horned ruminants of North America - Bulletin of the American Museum of Natural History (69), 1-669 (, English)
E. M. Schlaikjer, 1935 - Contributions to the Stratigraphy and Palaeontology of the Goshen Hole Area, Wyoming. III. A New Basal Oligocene Formation - Bulletin of the Museum of Comparative Zoology (76), 71-93 (journal article, English)
H. J. Cook, 1934 - New artiodactyls from the Oligocene and Lower Miocene of Nebraska - American Midland Naturalist (15), 148-165 (journal article, English)
R. S. Lull, 1922 - Primitive Pecora in Yale Museum - American Journal of Science (200), - (journal article, English)
L. M. Lambe, 1908 - The Vertebrata of the Oligocene of the Cypress Hills, Saskatchewan - Contributions to Canadian Palaeontology (3), 1-65 (serial monograph, English)
E. Douglass, 1903 - New vertebrates from the Montana Tertiary - Annals of Carnegie Museum (2), 145-199 (journal article, English)
K. A. Zittel, 1893 - Handbuch der Paläontologie, Abteilung I. Paläeozoologie. Band IV, Vertebrata (Mammalia) - R. Oldenbourg (), 1-799 (book, English)
E. D. Cope, 1889 - The Vertebrata of the Swift Current River, II - The American Naturalist (23), 151-155 (journal article, English)
E. D. Cope, 1885 - The White River beds of Swift Current River, Northwest Territory - American Naturalist (19), 163- (journal article, English)
E. D. Cope, 1873 - Third Notice Of Extinct Vertebrata From The Tertiary of the Plains - Paleontological Bulletin (16), 1-8 (journal article, English)
J. Leidy, 1853 - [On leave granted, Dr. Leidy made the following coinmnunication] - Proceedings of the Academy of Natural Sciences of Philadelphia (6), 392-394 (abstract, English)