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.
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N. J. Czaplewski, 2002 - A Pleistocene tapir and associated mammals from the southwestern Ozark Highland - (64), 97-107 (journal article, English)
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W. Stone, 1902 - A collection of mammals from Sumatra, with a review of the genera Nycticebus and Tragulus - Proceedings of the Academy of Natural Sciences of Philadelphia (54), 127-142 (journal article, English)