Harper, D. A. T., N. M. Savage, E. F. Owen, S. J. Carlson, Sun Dong-Li, and M. O. Manceñido. “Part H, Brachiopoda (Revised), Vol. 6, Ch. 6, P. 2684–2741”. Treatise on Invertebrate Paleontology (January 1, 2007). Accessed May 18, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5520.