Hooper, J.N.A.; Van Soest, R.W.M. (Eds.). (2002). Systema Porifera: a guide to the classification of Sponges. Kluwer Academic/ Plenum Publishers: New York, Boston, Dordrecht, London, Moscow. 2 Volumes. 1706 pp. [2002 printed version ISBN 0-306-47260-0, 2004 eBook electronic version ISBN 978-1-4615-0747-5]. available online athttps://www-springer-com.naturalis.idm.oclc.org/gp/book/9780306472602[details]