Savage, N. M., E. F. Owen, R. E. Grant, M. O. Manceñido, Sun Dong-Li, A. S. Dagys, and S. J. Carlson. “Part H, Brachiopoda (Revised), Vol. 4, Ch. 2, P. 1027–1131”. Treatise on Invertebrate Paleontology (January 1, 2002). Accessed May 6, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5563.