Harper, D. A. T., and Alwyn Williams. “Part H, Brachiopoda (Revised), Vol. 2 & 3, Ch. 8, P. 782–846”.
Treatise on Invertebrate Paleontology
(January 1, 2000). Accessed March 29, 2025.
https://journals.ku.edu/InvertebratePaleo/article/view/5213
.