References
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Nekola, J.C. 2002. Effects of fire management on the richness and abundance of central North American grassland land snail faunas. Animal Biodiversity and Conservation 25.2:53-66
Nekola, J.C. 2003. Large-scale terrestrial gastropod community composition patterns in the Great Lakes region of North America. Diversity and Distributions. 9: 55-71
NatureServe. 2006. NatureServe's Central Databases. < URL: http://export.nbii.gov/xml/natureserv/html/Pupillidae/0/ELEMENT_GLOBAL_2_118076.html> Accessed 5 October 2011.
University of California Museum of Paleontology. 2002. < URL: Http://www.ucmp.berkely.edu/taxa/inverts/mollusca/gastropoda.php> Accessed 12 November 2011.