Cox, L. R., Ruth D. Turner, C. P. Nuttall, E. R. Trueman, D. W. Boyd, B. F. Perkins, H. S. Puri, et al. “Part N, Mollusca 6, Vol. 3, Complete Volume”. Treatise on Invertebrate Paleontology (January 1, 1971). Accessed July 22, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5602.