British opisthobranch molluscs: Mollusca: Gastropoda: keys and notes for the identification of the species
Thompson, T.E.; Brown, G.H. (1976). British opisthobranch molluscs: Mollusca: Gastropoda: keys and notes for the identification of the species. Synopses of the British Fauna, N.S. 8. Academic Press: London. ISBN 0-12-689350-0. 203 pp.
Part of: Barnes, R.S.K.; Crothers, J.H. (Ed.) Synopses of the British Fauna. Linnean Society of London: London; New York. ISSN 0082-1101, more
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