1. Barrois, C. 1876. Recherches sur le terrain Crétacé Supérieur de l'Angleterre et de l'Irlande. Mémoire de la Société Géologique du Nord. Libairie J.-B. Bailliére & Fils, Paris.
2. Bate, R.H. & Wilkinson, I.P. 1988. British Micropaleontological Society Field Guide No.3. The Jurassic and Cretaceous of eastern England. Thames Polytechnic, London, 1–71.
3. On The Chalk of Yorkshire
4. The zones of the Lower Chalk of Lincolnshire
5. Belemnites from the Coniacian to Lower Campanian chalks of Norfolk and southern England;Christensen;Palaeontology,1991