1. Bakus, G. J., Abbott, D. P. (1980). Porifera: the sponges. In: Morris, R. H., Abbott, D. P., Haderlie, E. C. (eds.), Intertidal invertebrates of California. Stanford University Press, Stanford, p. 21?39
2. Proc. 3rd Colloquium on Echinoderms;R. Birenheide,1992
3. Canicatti, C., D'Ancona, G., Farina-Lipari, E. (1989). The Holothuria polii brown bodies. Boll. Zool. 56: 275?283 (1989)
4. Cobb, J. L. S., Sneddon, E. (1977). An ultrastructural study of the gills of Echinus esculentus. Cell Tissue Res. 182: 265?274
5. De Ridder, C., Jangoux, M. (1984). Intracoelomic parasitic Sporozoa in the burrowing spatangoid echinoid Echinocardium cordatum: coelomocyte reaction and formation of brown bodies. Helgoländer Meeresunters. 37: 225?231