Williams, Alwyn, P. R. Racheboeuf, N. M. Savage, D. E. Lee, L. E. Popov, S. J. Carlson, Alan Logan, et al. “Part H, Brachiopoda (Revised), Vol. 6, Complete Volume”. Treatise on Invertebrate Paleontology (January 1, 2007). Accessed November 3, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5526.