BioStor
 | New names introduced by H. A. Pilsbry in the Mollusca and Crustacea William J Clench and Ruth D Turner (1962) Special Publication Academy of Natural Sciences of Philadelphia 4: 1-224 |
 | Land mollusks (Gastropoda: Pulmonata) from early Tertiary Bozeman group, Montana Barry Roth (1986) Proceedings of the California Academy of Sciences 44: 237-267 |
 | Land Mollusca of Baja California, Mexico Allyn G Smith, Walter B Miller et al. (1990) Proceedings of the California Academy of Sciences 47(4): 95-158 |