Links to other sites:
University of Wisconsin - La Crosse
References:
Baker, F.C., 1939. Fieldbook of Illinois land snails. State of Illinois Natural History Survey Division, Urbana, Illinois, USA.
Branson, B.A., The recent Gastropoda of Oklahoma, part IV. terrestrial species, families Polygyridae and bulimilidae. Proceedings of the Oklahoma Academy of Science 42: 60-80.
Dourson, D. 2006. A survey of terrestrial Mollusca in selected areas of the land between the lakes national recreation area. Journal of the Kentucky Acedemy of Science.
Dourson, D. and J. Dourson. 2006.Land snails of the Great Smoky Mountains (Eastern Region). Appalachian Highlands Science Learning Center Purchase Knob Great Smoky Mountains National Park.
Hickman, C.P., L.S. Roberts, S.L.Keen, A. Larson, D.J. Eisenhour. 2009. Animal Diversity: 5th Edition. McGraw Hill, NewYork, New York, USA 179-190.
Kroll, A.J., K. Boykin, M.C. Andersen,B.C. Thompson, D.L. Daniel. 2003. Habitat characteristics of Ashmunella (Gastropoda: Pulmonata: Polgyridae) at White Sands Missile Range and Fortbliss, New Mexico. The Southwestern Naturalist 48:14-22.
Myers, P., R. Espinosa, C. S. Parr,T. Jones, G. S. Hammond, and T. A. Dewey. 2012. The Animal Diversity Web(online). Accessed at http://animaldiversity.org.
NatureServe. 2011. NatureServe explorer: an online encyclopedia of life. Version 7.1. NatureServe, Arlington,Virginia. URL: http://www.natureserve.org/explorer Accessed 13 March 2012.
Steensma, K.M.M., P.L. Lilley, H.M. Zandberg. 2009. Life history and habitat requirements of the Oregon Forestsnail, Allogona Townsediana (Mullusca, Gastropoda, Pulmonata, Polygyridae), in a British Columbia population. Invertebrate Biology 128:232-242.
Wilbur, K.M. and Younge C.M. 1966. Physiology of Mollusca vol.2. Academic Press Inc., New York, New York, USA.