Cohen, B. L., L. S. Peck, G. B. Curry, A. B. Gawthrop, A. D. Ansell, and M. C. Rhodes. 1997. “Part H, Brachiopoda (Revised), Vol. 1, Ch. 2, P. 189–242”. Treatise on Invertebrate Paleontology, January. https://doi.org/10.17161/dt.v0i0.5554.