Classification of the Paleozoic stromatoporoids. Steiner, M., D. Mehl, J. Reitner, and B. D. Erdtmann. 1993. Sponges in Time and Space. Balkema Press, Rotterdam. VanSoest, R. W. M. and E. Hajdu.
Marine area relationships from twenty sponge phylogenies.
A comparison of methods and coding strategies. West, L. and D. Powers. Molecular phylogenetic position of hexactinellid sponges in relation to the Protista and Demospongiae. Wood, R. 1990. Woollacott, R. M. and R. L. Pinto.