Cornelius, P.F.S.; Manuel, R.L.; Ryland, J.S.. «Cnidaria». A: P. J. Hayward and J. S. Ryland. Introduction and Protozoans to Arthropods (en anglès). I. Oxford, New York: Oxford University Press, 1991-02-21 (The Marine Fauna of the British Isles and North-West Europe). ISBN 9780198573562.