Hooper, J.N.A.; Van Soest, R.W.M.; Debrenne, F. (2002). Phylum Porifera Grant, 1826. pp. 9-14 <i>in</i>: Hooper, J.N.A.; van Soest, R.W.M. (Eds.) Systema Porifera: a guide to the classification of sponges. Volume 1 (Kluwer Academic/ Plenum Publishers: New York, Boston, Dordrecht, London, Moscow). (look up in IMIS) [details]