Kaesler, Roger L., S. J. Carlson, Alwyn Williams, and C. H. C. Brunton. “Part H, Brachiopoda (Revised), Vol. 4, Front Matter”. Treatise on Invertebrate Paleontology (January 1, 2002). Accessed November 21, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5561.