Selden, Paul A., C. H. C. Brunton, Alwyn Williams, and S. J. Carlson. “Part H, Brachiopoda (Revised), Vol. 6, Front Matter”. Treatise on Invertebrate Paleontology (January 1, 2007). Accessed December 21, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5514.