Muir-Wood, H. M., and Alwyn Williams. “Part H, Brachiopoda, Vol. 1 & 2, Ch. 4, P. 361-521”.
Treatise on Invertebrate Paleontology
(January 1, 1965). Accessed May 5, 2025.
https://journals.ku.edu/InvertebratePaleo/article/view/5546
.