Priapulids, sipunculans, echiurans, and entoprocts: Phylum Cephalorhyncha
Knight-Jones, E.W.; Ryland, J.S. (2017). Priapulids, sipunculans, echiurans, and entoprocts: Phylum Cephalorhyncha, in: Hayward, P.J. et al. (Ed.) Handbook of the marine fauna of North-West Europe. pp. 271-281
In: Hayward, P.J.; Ryland, J.S. (Ed.) (2017). Handbook of the marine fauna of North-West Europe. Second edition. Oxford University Press: Oxford. ISBN 978-0-19-954944-3. xiii, 785 pp., meer
