Alvarez, Fernando, D. I. MacKinnon, N. M. Savage, Rong Jia-Yu, S. J. Carlson, and Paul Cooper. “Part H, Brachiopoda (Revised), Vol. 4, Ch. 8, P. 1584–1616”. Treatise on Invertebrate Paleontology (January 1, 2002). Accessed December 4, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5569.