Sea urchins, starfish and sea cucumbers (Phylum Echinodermata)
Moyse, J.; Tyler, P.A. (1996). Sea urchins, starfish and sea cucumbers (Phylum Echinodermata), in: Hayward, P.J. et al. (Ed.) (1995). Handbook of the marine fauna of North-West Europe. pp. 662-686
In: Hayward, P.J.; Ryland, J.S. (Ed.) (1995). Handbook of the marine fauna of North-West Europe. First edition. Oxford University Press: Oxford. ISBN 0-19-854054-X. XI, 800 pp., more