^[1]Linisa at ITIS (Integrated Taxonomic Information System); accessed 31 Jan. 2008.
^Pilsbry, Henry A. 1940. Land Mollusca of North America (North of Mexico). Acad. Nat. Sci. Philadelphia, Monograph 3, vol. 1(2): 617-620.
Pilsbry, H. A. (1956). Inland Mollusca of Northern Mexico. III. Polygyridae and Potadominae. Proceedings of the Academy of Natural Sciences of Philadelphia. 108: 19–40.
Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017
^[1]Linisa at ITIS (Integrated Taxonomic Information System); accessed 31 Jan. 2008.
^Pilsbry, Henry A. 1940. Land Mollusca of North America (North of Mexico). Acad. Nat. Sci. Philadelphia, Monograph 3, vol. 1(2): 617-620.
Pilsbry, H. A. (1956). Inland Mollusca of Northern Mexico. III. Polygyridae and Potadominae. Proceedings of the Academy of Natural Sciences of Philadelphia. 108: 19–40.
Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017