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.
Deel van: Barnes, R.S.K.; Crothers, J.H. (Ed.) Synopses of the British Fauna. Linnean Society of London: London; New York. ISSN 0082-1101, meer
Is gerelateerd aan:Gibbs, P.E. (1977). British sipunculans. Synopses of the British Fauna, N.S. 12. Academic Press: London. ISBN 0-12-282050-9. 35 pp., meer
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