Pilsbry, H.A. & Y. Hirase. 1908. New land and fresh-water Mollusca of the Japanese Empire. Proceedings of the Academy of Natural Sciences of Philadelphia 60: 31-. https://www.biodiversitylibrary.org/page/6396098.
Pilsbry & Hirase, 1908. Proc. Acad. Nat. Sci. 60: 35, fig. 1.