Williamson, T.E. & Kirkland, J.I. & Lucas, S.G. (1993)
Selachians from the Greenhorn cyclothem («Middle» Cretaceous: Cenomanian-Turonian), Black Mesa, Arizona, and the paleogeographic distribution of late Cretaceous selachians.
Journal of Paleontology, 67(3), 447–474
Lucas, S.G. & Heckert, A.B. (2005)
Distribution, age and correlation of Cretaceous fossil vertebrates from Arizona.
New Mexico Museum of Natural History and Science, Bulletin, 29, 104–109