Cope, E.D. (1875)
The Vertebrata of the Cretaceous formations of the West. Report of the United States Geological Survey of the Territories, 2: 303 p., 67 pl.

Cicimurri, D.J. & Parris, D.C. & Everhart, M.J. (2008)
Partial dentition of a chimaeroid fish (Chondrichthyes, Holocephali) from the Upper Cretaceous Niobrara Chalk of Kansas, USA. Journal of Vertebrate Paleontology, 28(1), 34–40
DOI: 10.1671/0272-4634(2008)28[34:PDOACF]2.0.CO;2