Case, G.R. & Cappetta, H. (1997)
A new selachian fauna from the Late Maastrichtian of Texas (Upper Cretaceous/Navarro Group; Kemp Formation). Münchner Geowissenschaftliche Abhandlungen Reihe A: Geologie und Paläontologie, 34: 131–189, 10 fig., 15 pl.
Hartstein, E. & Decina, L. & Keil, R. (1999)
A late Cretaceous (Severn Formation) Vertebrate Assemblage from Bowie Maryland. Mosasaur, 6: 17–24
Becker, M.A. & Chamberlain, J.A. & Terry, D.O. (2004)
Chondrichthyans from the Fairpoint Member of the Fox Hills Formation (Maastrichtian), Meade County, South Dakota. Journal of Vertebrate Paleontology, 24(4), 780–793
DOI: 10.1671/0272-4634(2004)024[0780:CFTFMO]2.0.CO;2
Case, G.R. & Cappetta, H. (2013)
Ewingia Case & Cappetta, 1997 (Chondrichthyes: Rajiformes), preoccupied by Ewingia pearse, 1929 (Insecta: Arachnida). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 268(1), 125–126
DOI: 10.1127/0077-7749/2013/0320