HAMM, S.A. (2008)
Systematic, stratigraphic, geographic, and paleoecological distribution of the Late Cretaceous shark genus Ptychodus within the Western Interior Seaway. Unpublished MS thesis, University of Texas, Dallas, 434 pp
HAMM, S.A. (2009)
New Data on the Occurrence and Distribution of Ptychodus from the Upper Cretaceous (Coniacian-Santonian) of Texas . Dallas Paleontological Society, Occasional Papers, 8: 1–31
HAMM, S.A. & CICIMURRI, D.J. (2011)
Early coniacian (late cretaceous) selachian fauna from the basal Atco Formation, lower Austin Group, north central Texas. Paludicola, 8 (3): 107–127
Chondrichthyans from the Upper Cretaceous of Venezuela: Diversity and Palaeobiogeographic implications. Abstract. In: SCHWARZ, C. & KRIWET, J. (editors): 6th International Meeting on Mesozoic Fishes – Diversification and Diversity Patterns, Vienna, Austria August 4th–10th, 2013: 13
The first tooth set of Ptychodus atcoensis (Elasmobranchii: Ptychodontidae), from the Cretaceous of Venezuela. Swiss Journal of Palaeontology, 132 (1): 69–75
DOI: 10.1007/s13358-013-0053-3