Macurda, Jr., D. B., Michel Roux, H. L. Strimple, J. C. Brower, Georges Ubaughs, N. Gary Lane, D. L. Meyer, Albert Breimer, H. Wienberg Rasmussen, and Raymond C. Moore. “Part T, Echinodermata 2, Vol. 1-3, Ch. 2, P. 217 - 316”. Treatise on Invertebrate Paleontology (January 1, 1978). Accessed May 2, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5643.