HARLTON, B.H. (1933)
Micropaleontology of the Pennsylvanian Johns Valley shale of the Ouachita Mountains, Oklahoma, and its relationship to the Mississippian Caney shale. Journal of Paleontology, 7 (1): 3–29
HANSEN, M.C. (1986)
Microscopic chondrichthyan remains from Pennsylvanian marine rocks of Ohio and adjacent areas. Unpublished PhD thesis, Ohio State University, Columbus, Ohio. 2 vols. 514pp.
JOHNSON, G.D. (2005)
An unusual tricuspid chondrichthyan tooth from the Lower Permian of Texas, USA. Revista Brasileira de Paleontologia, 8 (2): 159–164
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.