Moore, R. C., N. H. Ludbrook, J. Brookes Knight, C. M. Yonge, E. L. Yochelson, and A. G. Smith. “Part I, Mollusca 1, Ch. 1, p.1-84”. Treatise on Invertebrate Paleontology (January 1, 1960). Accessed November 23, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5583.