Berger, J. 1986. Wild horses of the Great Basin. Univ. Chicago Pr., Chicago. 326 pp.

Boyd, L., and K. A. Houpt. 1994. Przewalski's hourse: the history and biology of an endnagered species. State Univ. New York, (?). 313 pp. SF363

Dagg, A. I., and J. B. Foster. 1976. Giraffe: Its biology, behavior and ecology. [reprinted 1982] Krieger Publ. Co., Melbourne, FL. 248 pp.

Fischer, M. F. 1992. Hyracoidea. Handbuch der Zoologie, Band 8 Mammalia, teilband 58. Walter de Gruyter, Berlin and New York. QL45.H2 no. 58 1992

Geist, V., and F. Walther, eds. 1974. The behavior of ungulates and its relation to management. Internat. Union Conserv. Nature and Natural Resources Publ., n.s., no. 24, 2 vols.

Janis, C. M. 1989. A climatic explanation for patterns of evolutionary diversity in ungulate mammals. Paleontology 32: 463-481.

Lydekker, R. 1913-1916. Catalogue of the ungulate mammals in the British Museum (Natural History). Trustees of the British Museum (Nat. Hist.), London.

• Vol. I. 1913. Artiodactyla, family Bovidae, subfamilies Bovinae to Ovibovinae (cattle, sheep, goats, chamois, serows, takin, musk-oxen, etc.). 249 pp.
  
• Vol. II. 1914. Artiodactyla, family Bovidae, subfamilies Bubalinae to Raduncinae (hartebeests, gnus, duikers, dik- diks, klipspringers, reedbucks, waterbucks, etc.). 295 pp. (assisted by G. Blaine).
  
• Vol. III. 1914. Artiodactyla, families Bovidae, subfamilies Aepycerotinae to Tragelaphinae (pala, saiga, gazelles, oryx group, bushbucks, kudus, elands, etc.), Antilocapridae (prongbuck), and Giraffidae (giraffes and okapi). 283 pp. (assisted by G. Blaine).
  
• Vol IV. 1915. Artiodactyla, families Cervidae (deer), Tragulidae (chevrotains), Camelidae (camels and llamas), Suidae (pigs and peccaries), and Hippopotamidae (hippopotamuses). 438 pp.
  
• Vol. V. 1916. Perissodactyla (horses, tapirs, rhinoceroses), Hyracoidea (hyraxes), Proboscidea (elephants). 207 pp. (contains general index to vols. I- V).

MacFadden, B. J. 1992. Fossil horses. Cambridge Univ. Pr., Cambridge and New York. 369 pp. QE882.U6M27 1992

MacFadden, B. J. 1976. Cladistic analysis of primitive equids, with notes on other perissodactyls. Syst. Zool. 25: 1-14.

Prothero, D. R., and R. M. Schoch, eds. 1989. The evolution of perissodactyls. Oxford Univ. Pr., New York. 537 pp. QE882.U6E96 1989

Putman, R. 1988. The natural history of the deer. Comstock Publ. Assoc., Cornell Univ. Pr., Ithaca. 191 pp. QL737.U55P87 1989

Rensberger, J. M., A. Forsten, and M. Fortelius. 1984. Functional evolution of the cheek tooth pattern and chewing direction in Tertiary horses. Paleobiology 10: 439-452.

Schaller, G. B. 1977. Mountain monarchs, wild sheep and goats of the Himalaya. Univ. Chicago Pr., Chicago. 426 pp.

Sinclair, A. R. E. 1977. The African buffalo. Univ. Chicago Pr., Chicago. 256 pp.

Van Soest, P. J. 1994. Nutritional ecology of the ruminant, 2nd ed. Comstock Publ. Assoc., Cornell Univ. Pr., Ithaca. 476 pp. SF95.V36 1994

Vrba, E. S., and G. B. Schaller, eds. 2000. Antelopes, deer, and relatives: fossil record, behavioral ecology, systematics, and conservation. Yale Univ. Pr., New Haven. 341 pp. QL737.U5 A64 2000

Wemmer, C. M., ed. 1987. Biology and management of the Cervidae. Smithsonian Inst. Pr., Washington, D.C. 577 pp. QL737.U55B5626 1987

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