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Catalogue of life: 2009 Annual Checklist. Web. 20 Mar. 2011. <

"Discus patulus (Domed disc)." Michigan State University Extension. Web. 28 Mar. 2011.   

Hotopp K., T. Pearce and D. Dourson. 2008. Land Snails of the Cheat River Canyon, West Virginia (Gastropoda: Pulmonata). 
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"Information and Facts." Infoqis Publishing, Co., Web. 27 Mar. 2011. <>.

Land Snails of Wisconsin. University of Wisconsin La Crosse, Web. 25 Mar. 2011. 
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      America. Diversity and Distributions 9: 55-71.

Nekola J.C. 2009. Acidophilic Terrestrial Gastropod Communities of North America. Oxford University Press 76: 144–156.

Örstan, Aydin. "North American Land snails: Discus patulus." Snail's Tales. 30 May 2006. Web. 20 Mar. 2011.
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Pilsbry, H.A. 1948. Land Mollusca of North America. Monographs of the Academy of Natural Sciences of Philadelphia, 3 (1-4)
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Watters G.T. , T. Menker and S. O’Dee. 2004. A comparison of terrestrial snail faunas between strip-mined land and 
      relatively undisturbed land
      in Ohio, USA – an evaluation of recovery potential and changing faunal assemblages.
Biological Conservation 126 (2)