Teichert, Curt, R. C. Moore, D. E. Nodine Zeller, W. M. Furnish, H. B. Stenzel, Bernhard Kummel, and Brian F. Glenister. “Part K, Mollusca 3, Complete Volume”. Treatise on Invertebrate Paleontology (January 1, 1964). Accessed September 14, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5262.