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References
- Arkell, W. J. et al. 1957. Treatise on invertebrate palaeontology. Part L. Mollusca 4. Geological Society of America and the University of Kansas Press. 490.
- Monks, N. & Palmer, P. 2002. Ammonites. Living Past. The Natural History Museum, London. 160.
- Parkinson, J. Organic Remains of a Former World : an examination of the mineralized remains of the Vegetables and Animals of the antediluvian world, generally termed extraneous fossils. London.1804-1811.
- Sowerby, J. 1821. The Mineral Conchology of Great Britain; or Coloured Figures and Descriptions of those Remains of Testaceous Animals or Shells, Which Have Been Preserved at Various Times, and Depths in The Earth. Vol. 4. London.