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1903
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Williston, Samuel W. and Oliver C. Farrington. North American plesiosaurs. Part 1. Field Columbian Museum Geological Series 2(1):1-77
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1928
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Ortenburger, Arthur I. The whip snakes and racers: Genera Masticophis and Coluber. Memiors of the University of Michigan Museum (1):1-247
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1946
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Lane, Henry H. A survey of the fossil vertebrates of Kansas, Part III. The reptiles. Transactions of the Kansas Academy of Science 49(3):289-332
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