Ubaghs 1967. Stylophora (with contribution from Gill, E. D.). Treatise on Invertebrate Paleontology. Part S. Echinodermata 1., Moore, R. C. (editor). Treatise on Invertebrate Paleontology. Part S. Echinodermata 1. Geological Society of America Inc.: University of Kansas Press, 1967: 495-565. Chapter pagination: 495-565