BioStor
 | TheHederelloidea, a Suborder of Paleozoic Cyclostomatous Bryozoa (1939) Proceedings of The United States National Museum 87: 25-91 |
 | Carboniferous and Permian species of the cyclostome bryozoan Corynotrypa Bassler, 1911 and their clonal propagation P D Taylor (1985) Bulletin of The British Museum (Natural History) Geology 38: 359-372 |