Literature
- Hayward, P.J., Wigham, G.D. & N. Yonow 1990. Mollusca I: Polyplacophora, Scaphopoda, and Gastropoda. In: The Marine Fauna of the British Isles and North-West Europe. (ed. P.J. Hayward & J.S. Ryland). Clarendon Press, Oxford: 628-730.
- Naef, A., 1921-1923 1928. Die Cephalopoda. Fauna und Flora des Golfes von Neapel. Monogr., 35(1): 863 pp; (2): 357 pp.
- Nesis, K.N. 1987. Cephalopods of the world. T.F.H. Publications, Inc., Ltd.
- Seaward, D.R. 1990. Distribution of the marine molluscs of north west Europe. Nature Conservancy Council.