Literature
- 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.
- Poppe, G.T. & Y. Goto 1993. European Seashells. Vol. II. 221 pp. Wiesbaden/Verlag Christa Hemmen.