Montgomery, G. G., ed. 1985. The evolution and ecology of armadillos, sloths, and vermilinguas. Smithsonian Inst. Pr., Washington, D.C. 451 pp.

Naples, V. L. 1982. Cranial osteology and function in tree sloths, Bradypus and Cholepus. Amer. Mus. Novitates 2739: 1-41.

Naples, V. L., and R. K. McAfee. Updated 2-15-01. Sloth world: An online bibliography and database of sloth papers from around the world. http://www.bios.niu.edu/naples/slothweb/slothwld.html

Patterson, B., W. Segall, and W. D. Turnbull. 1989. The ear region in xenarthrans (=Edentata: Mammalia). Part I. Cingulates. Fieldiana Geol., n.s., 18: 1-46.

Patterson, B., W. Segall, W. D. Turnbull, and T. J. Gaudin. 1992. The ear region in xenarthrans (=Edentata: Mammalia). Part II. Pilosa (sloths, anteaters), palaeanodonts, and a miscellany. Fieldiana Geol., n.s., 24: i-v, 1-79.

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