Literature
- 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.
- Voss, G.L. & G.R.Williamson 1972. Cephalopods of Hong Kong. 138 pp. Hong Kong Govt. Press.