Muir-Wood, H. M., G. F. Elliott, F. G. Stehli, and Kotora Hatai. 1965. “Part H, Brachiopoda, Vol. 1 & 2, Ch. 7, P. 728-864”. Treatise on Invertebrate Paleontology, January. https://doi.org/10.17161/dt.v0i0.5549.