British sipunculans: keys and notes for the identification of the species
Gibbs, P.E. (1977). British sipunculans: keys and notes for the identification of the species. Synopses of the British Fauna, N.S. 12. Academic Press: London. ISBN 0-12-282050-9. 35 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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