Hemichordata and Urochordata
Knight-Jones, E.W.; Ryland, J.S. (1990). Hemichordata and Urochordata, in: Hayward, P.J. et al. The marine fauna of the British Isles and North-West Europe: 2. Molluscs to chordates. pp. 872-904
In: Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 2. Molluscs to chordates. Clarendon Press: Oxford. ISBN 0-19-857515-7. xvi, 628-996, pp., meer
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