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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
Guinot, G. & Condamine, F.L. (2023)
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080