Wright, C. W., and J. H. Calloman. “Part L, Mollusca 4 (Revised), Vol. 4, Ch. 2, P. 67-133”. Treatise on Invertebrate Paleontology (January 1, 1996). Accessed July 24, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5280.