Holmer, L. E., M. G. Bassett, and L. E. Popov. “Part H, Brachiopoda (Revised), Vol. 6, Ch. 3, P. 2532–2590”. Treatise on Invertebrate Paleontology (January 1, 2007). Accessed May 6, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5517.