1. Budd, D. A. &Perkins, R. D. 1980. Bathymetric zonation and paleoecological significance of microborings in Puerto Rican shelf and slope sediments. - Journal of sedimentary Petrology 50: 881–904, Lawrence, Kansas.
2. Cooper, P. 1985. Fossilized polyps in 340-myr-oldFavosites corals. - Nature 316: 142–144, London.
3. De Laubenfels, M. W. 1955. Porifera. - [In:] Moore, R. C. (ed.) Treatise on Invertebrate Paleontology, Pt. E, Archaeocyatha and Porifera: E21-E112. Geological Society of America, New York, and University of Kansas Press, Lawrence, Kansas.
4. Dunbar, C. O. 1927. Pseudopercula in the tabulate coralFavosites. - American Journal of Science 13: 101–114, New Haven, Connecticut.
5. Dunikowski, E. 1884. Über Permo-Carbon Schwämme von Spitzbergen. - Konglige Svenska Vettenskaps- Akademiens Handlingar, ser. 4, 21: 1–18, Stockholm.