References

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Forsyth, R.G. 2004. Land Snails of British Columbia. Royal BC Museum Handbook. Victoria, Royal British Columbia Museum, iv + 188 pp., [8] col. pl. 

Hickman, Cleveland P., Roberts, Larry S., Keen, Susan L., Larson, Allan and Eisenhour, David J. 2009. Animal Diversity. McGraw-Hill, Boston, Massachusetts, USA.

Land Snails of Wisconsin. <http://www.uwlax.edu/biology/faculty/perez/Perez/PerezLab/Research/WIsnailslist.htm>. Accessed 20 March 2011.

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