Muir-Wood, H. M., Elliott, G. F., Stehli, F. G., & Hatai, K. (1965). Part H, Brachiopoda, vol. 1 & 2, ch. 7, p. 728-864. Treatise on Invertebrate Paleontology. https://doi.org/10.17161/dt.v0i0.5549