Burch, J. 1962. Conservation assessment for Delicate vertigo. How to know eastern land snails. 1:1-11.

Larson, D., McMillan, M., and Nekola, J. 2003.   Effects of rock climbing on the land snail community of the Niagara escarpment in southern Ontario, Canada. Conservation biology 17:1-6.

Martin, S. 2000. Terrestrial snails and slugs (mollusca: gastropoda) of Maine. Northeastern naturalist 7:33-88.  

Morse, E. 1868. The land snails of New England (Concluded). The American naturalist 1:666-672.  

Nekola, J. 2003. Large-scale terrestrial gastropod community composition patterns in the Great Lakes region of North America. Diversity and distributions 9:55-71.  

Nekola, J. 2003. Terrestrial gastropod fauna of northeastern Wisconsin and the southern upper peninsula of Michigan. American malacological bulletin 18:1-24.  

Pilsbry, H. 1948. Land mollusca of North America (north of Mexico). The academy of natural sciences of Philadelphia 2:981.

Walker, B. 1905. An illustrated catalogue of the mollusca of Michigan. Wynkoop Hallenbeck Crawford Company, Lansing, Michigan, USA.

Wisconsin Department of Natural Resources. 2009. <URL:>. Accessed 28 March 2011.