Sipunculans
Gibbs, P.E. (2001). Sipunculans. Revised edition. Synopses of the British Fauna, N.S. 12. Field Studies Council: Shrewsbury. ISBN 1-85153-264-1. vii, 46 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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