References

  • Binney, W. G. 1885. A Manual of American Land Shells. Government Printing Office, Washington, USA.

  • Bio-dynamic association of india. (2006). Retrieved from http://www.biodynamics.in/humus.htm

  • Burch, J. B. 1982. Freshwater snails of North America. Environmental Monitoring and Support Laboratory, Office of Research and Development, U.S. Environmental Protection Agency : Center for Environmental Research Information, Cincinnati, Ohio, USA.

  • Cheatum, E. P., & Fullington, R. W. (1971). The aquatic and land mollusca of texas: The recent and pleistocene members of the gastropod family polygyridae in texas. (pp. 18-20). Dallas, Texas: The Dallas Natural Science Association and The Dallas Museaum of Natural History.

  •  Goodrich, C. 1922. The Anculosae of the Alabama River Drainage. Museum paper No. 6. University of Michigan. Ann Arbor,  Michigan, USA.

  • Marshall, A.J., Williams, W.D. (Eds) "Textbook of Zoology", Vol:1 Invertebrates. 7th Ed. Macmillan

  • Pilsbry, H. A. 1939. Land Mollusca of North America. George W. Carpenter Fund for the Encouragement of Original Scientific Research, Philadelphia, Pennsylvania, USA.

  • snail-world.com. (n.d.). Retrieved from http://www.snail-world.com/

  • Webb, W. F. 1942. United States Mollusca; a descriptive manual of many of the marine, land and fresh water shells of North America, North of Mexico. Rochester, New York, USA

  • Wikimedia foundation. (2012, february 11). Retrieved from http://wikimediafoundation.org/wiki/Home