Moore, R. C., J. W. Wells, H. J. Harrington, Dorothy Hill, Hilbrand Boschma, and Libbie H. Hyman. “Part F, Coelenterata, Ch. 1, P .1-106”. Treatise on Invertebrate Paleontology (January 1, 1956). Accessed November 24, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5536.