Williamson, T.E. & Lucas, S.G. (1993)
Freshwater selachians from the early Palaeocene of the San Juan Basin, north-western Mexico, USA. Tertiary Research, 14(3): 97–105, 1 fig., 2 pl.
Menasco-Davis, L. & Stidham, T. (2009)
Earliest paleocene recovery of marine vertebrates: evidence from the basal Kincaid Formation, eastern Texas. Abstract Journal of Vertebrate Paleontology, 29(Supplement to Number 3), 147A