Sirna, G. & Dalla Vecchia, F.M. & Muscio, G. & Piccoli, G. (1994)
Catalogue of Paleozoic and Mesozoic Vertebrates and Vertebrate localities of the Tre Venezie area (North Eastern Italy). Memorie degli Istituti di Geologia e Mineralogia dell'Universita di Padova, 46, 255–281

Trbusek, J. (1999)
Upper Cretaceous Sharks and Rays from the Prokop Opencast Mine at Brezina Near Moravska Trebova. Acta Universitatis Palackianae Olmucensis, Geologica, 36, 51–61

Everhart, M.J. & Caggiano, T. & Shimada, K. (2003)
Note on the occurrence of five species of ptychodontid sharks from a single locality in the Smoky Hill Chalk (Late Cretaceous) of western Kansas [Abstract]. Kansas Academy of Science, Abstracts 22: 29

Shimada, K. & Cicimurri, D.J. (2006)
Annotated checklist of fossil fishes from the Smoky Hill Chalk of the Niobrara Chalk (Upper Cretaceous) in Kansas. New Mexico Museum of Natural History and Science, Bulletin, 35, 193–213

Amadori, M. & Amalfitano, J. & Giusberti, L. & Fornaciari, E. & Carnevale, G. & Kriwet, J. (2019)
Resti inediti di Ptychodus Agassiz, 1834 (Ptychodontiae, Chondrichthyes) conservati presso il Museo Civico di Rovereto (Trento). Annali del Museo Civico di Rovereto, 34, 221 247