Popov, L. E., L. E. Holmer, L. R. M. Cocks, M. G. Bassett, P. R. Racheboeuf, Rong Jia-Yu, and Alwyn Williams. “Part H, Brachiopoda (Revised), Vol. 6, Ch. 4, P. 2590–2638”. Treatise on Invertebrate Paleontology (January 1, 2007). Accessed November 24, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5518.