Brusca, Richard C., & Gary J. Brusca, 1990, Invertebrates - xiii + 992. Sinauer Associates, Inc. Sunderland, Massachusetts, USA - ISBN/ISSN: 0-87893-098-1.
Hooper, John N. A., & Rob W. M. van Soest, 2002. Systema Porifera: A Guide to the Classification of Sponges - xlviii + 1708 - Kluwer Academic / Plenum Publishers, New York, USA - ISBN/ISSN: 0-306-47260-0. (Notes: Published in two volumes: Volume 1 - Introductions and Demospongiae; Volume 2 - Calcarea, Hexactinellida, Sphinctozoa, Archaeocyatha, unrecognizable taxa, and Index of higher taxa)