L. William Stephenson, ?Larger invertebrate fossils of the Woodbine Formation (Cenomanian) of Texas?, Geological Survey Professional Paper, vol. 242, pp. 1-226, 1952.

I. G.  Speden, ?The Type Fox Hills Formation, Cretaceous (Maestrichtian), South Dakota. Part 2. Systematics of the Bivalvia?, Peabody Museum of Natural History Bulletin, vol. 33, pp. 1-222, 1970.

E.  Savazzi, ?Functional morphology and autecology of Pseudoptera (bakevelliid bivalves, Upper Cretaceous of Portugal)?, Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 46, pp. 313-324, 1984.

P.  Fischer, Manuel de cochyliologie et de paléontologie conchyliologique ou histoire naturelle des mollusques vivants et fossiles suivi d'un appendice sur les brachiopodes, vol. 2, 2 vol. Paris: F. Savy, 1887, p. xxiv+1369.

E.  Savazzi, ?Functional morphology and autecology of Pseudoptera (bakevelliid bivalves, Upper Cretaceous of Portugal)?, Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 46, pp. 313-324, 1984.

I. G.  Speden, ?The Type Fox Hills Formation, Cretaceous (Maestrichtian), South Dakota. Part 2. Systematics of the Bivalvia?, Peabody Museum of Natural History Bulletin, vol. 33, pp. 1-222, 1970.

L. William Stephenson, ?Larger invertebrate fossils of the Woodbine Formation (Cenomanian) of Texas?, Geological Survey Professional Paper, vol. 242, pp. 1-226, 1952.