References

Dillon, R. T., Jr., B.T. Watson & T. W. Stewart 2006. The freshwater gastropods of North America.              Internet address: http://www.fwgna.org

Helisoma anceps Habitat July 2011. http://www.natureserve.org/explorer/servlet/NatureServe?searchName=Helisoma+anceps+.     Acessed Nov. 1 2011.

Johnson, Pieter. Linkage in Environment Nutrients. New York: Oxford University, 2005.

Kease, Brian. "The Effect of Diet and Reproduction." Journal of Parasitology. (1999): n. page  Print.<www.jstor.org/pss/32843235246584>.

Mitton, Jeff. Selection in Natural Populations. Oxford, New York: Oxford University Press           1997. <http://www.questia.com/PM.qst?a=o&d=64448489>.

Noore, James. Invertebrate Pathology. Oxford New York: Oxford University, 2000.

Wedel, Waldo. AN INTRODUCTION TO KANSAS ARCHEOLOGY. Washington DC: US Government                   Print Off,   2001. <http://www.questia.com/PM.qst?a=o&d=54821017>.

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