Parker, J. «Obituary». The gentleman's magazine and historical review, 216, 1864, pàg. 536.
Martin, William. Petrificata Derbiensia, 1809. «p39 Fig 4....A fossil shell. The original a nautilus ... The crocodile said to be found in the limestone of Ashford, appears to be just a large specimen of this or some other Orthoceratite»