Cragin, F.W. (1894)
Vertebrates from the Neocomian shales of Kansas.
Colorado College Stud., 5: 69–73, pl. 1–2.
Hay, O.P. (1902)
Bibliography and catalogue of the fossil Vertebrata of North America.
Bulletin of the United States Geological and Geographical Survey of the Territories, 179, 1–868