Sponges in Time and Space: Biology, Chemistry, Paleontology. Proceedings of the Fourth International Porifera Congress, Amsterdam, Netherlands, April 19-23, 1993
Van Soest, R.W.M.; Van Kempen, T.M.G.; Braekman, J.C. (Ed.) (1994). Sponges in Time and Space: Biology, Chemistry, Paleontology. Proceedings of the Fourth International Porifera Congress, Amsterdam, Netherlands, April 19-23, 1993. A.A. Balkema: Amsterdam. ISBN 9054100974. 515 pp.