Ford A.H., Crick G.C. (1890) On some new and imperfectly defined species of Jurassic, Cretaceous, and Tertiary Nautili contained in the British Museum (Natural History) // Ann. Mag. Nat. Hist., 6th ser., vol. 5, pp. 388-409.
Pdf: http://edocs.ub.uni-frankfurt.de/volltex....901.pdf Hyatt A. (1883) Genera of Fossil Cephalopods // Boston Society of Natural History Proceedings, Vol. XXII, pp. 253-338.
pdf: http://edocs.ub.uni-frankfurt.de/volltex....945.pdf