Hershler, Robert and Liu, Hsiu-Ping. 2008. "Ancient vicariance and recent dispersal of springsnails (Hydrobiidae: Pyrgulopsis) in the Death Valley system, California-Nevada." in Late Cenozoic drainage history of the southwestern Great Basin and lower Colorado River region: geologic and biologic perspectives, edited by Reheis, M. C., Hershler, Robert, and Miller, D. M., 91–101. Denver, CO: Geological Society of America Special Paper 439.