Lund, R. (1989)
New petalodonts (Chondrichthyes) from the Upper Mississippian Bear Gulch Limestone (Namurian E2b) of Montana. Journal of Vertebrate Paleontology, 9(3), 350–368
DOI: 10.1080/02724634.1989.10011767

Frickhinger, K.A. (1991)
Fossilienatlas Fische. Verlag für Natur- und Heimatkunde Hans A. Baensch, Melle

Ginter, M. & Hampe, O. & Duffin, C.J. (2010)
Handbook of Paleoichthyology, Vol. 3D: Chondrichthyes Paleozoic Elasmobranchii: Teeth Verlag Dr. Friedrich Pfeil, pp. 168, 154 fig., 4 Tab.

Richards, K.R. & Clack, J.A. (2012)
Chondrichthyans in the carboniferous of the british derbyshire peak district [Abstract]. Journal of Vertebrate Paleontology, 32(Suppl. 1), 161
DOI: 10.1080/02724634.2012.10635175