Wright, C. W., and J. H. Calloman. “Part L, Mollusca 4 (Revised), Vol. 4, Ch. 4, P. 206-258”. Treatise on Invertebrate Paleontology (January 1, 1996). Accessed November 21, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5282.