Zangerl, R. (1968)
The morphology and the developmental history of the scales of the Paleozoic sharks Holmesella? sp. and Orodus. Nobel Symposium, 4, 399–412
Case, G.R. (1970)
The occurrence of Petrodus and other fossil shark remains in the Pennsylvanian of Iowa. Annals of Iowa, ser. 3, 40(6): 445–449., 2 figs.
Schultze, H.-P. & Stewart, J.D. & Neuner, A.M. & Coldiron, R.W. (1982)
Type and figured specimens of fossil vertebrates in the collection of the University of Kansas Museum of Natural History. Part I. Fossil Fishes. University of Kansas, Museum of Natural History, Miscellaneous Publication, 73: 1–53