1875
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Cope, Edward D. Check-list of North American Batrachia and Reptilia; with a systematic list of the higher groups, and an essay on geographical distribution. Based on the specimens contained in the U.S. National Museum. Bulletin of the United States National Museum 1():1-104
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1892
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Cope, Edward D. A critical review of the characters and variations of the snakes of North America. Proceedings of the United States National Museum 14():589-694
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1994
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Crombie, Ronald I. Herpetological publications of the National Museum of Natural History (USNM). 1853-1994. Smithsonian Herpetological Information Service (101):40
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