Cicimurri, D.J. (2001)
Cretaceous elasmobranchs of the Greenhorn Formation (Middle Cenomanian-Middle Turonian), western South Dakota Proceedings of the 6th Fossil Resource Conference: National Park Service Geological Resource Division Technical Report NPS/NRGRD/ GRDTR01/01. p. 27–43 in V. L. Santucci and L. McClelland(eds.),