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Pilsbry, H. A. (1948). Inland mollusks of Northern Mexico: I. The genera Humboldtiana, Sonorella, Oreohelix and Ashmunella. Proceedings of the Academy of Natural Sciences of Philadelphia. 100: 185-203.
Pilsbry, H. A. (1948). Inland mollusks of Northern Mexico: I. The genera Humboldtiana, Sonorella, Oreohelix and Ashmunella. Proceedings of the Academy of Natural Sciences of Philadelphia. 100: 185-203.
