Brunton, C. H. C., Jin Yu-Gan, and Stanislav Lazarev. “Part H, Brachiopoda (Revised), Vol. 2 & 3, Ch. 4, P. 424–565”. Treatise on Invertebrate Paleontology (January 1, 2000). Accessed May 2, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5209.