References
Bourqin, 2000 <URL:
http://www.manandmollusc.net/advanced_introduction/moll101gastropoda.html
> Accessed 5 November 2012
Casselman, 2012 <URL:
www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html >
Accessed 5 November 2012
Discover Life <URL:
www.discoverlife.org/20/q > Accessed 5 November 2012
Emberton, K. 1988. The Genitalic, Allozymic, and
Conchological Evolution of the Eastern North American Triodopsinae.
Journal of Malacologia 28: 159-273
Encyclopedia of Life <URL:
http://eol.org/pages/466635/overview > Accessed 5 November 2012
Gillis, R. 2012. Animal Biology Lab Manual. UW-L Department of
Biology. 6-3.
Grzimek B. 2003. Grzimek's Animal Life Encylopedia.
Neil Schlager, editor. Volume 2: Protostomes. Gale, Detroit. 411-414
Hickman, C.P., L.S. Roberts, S. L. Keen, A.
Larson, and D.J. Eisenhour. 2012. Animal Diversity. McGraw Hill, New
York, New York, USA. 90-91; 186-194
Netstate <URL:
www.netstate.com/states/geography/ok_geography.htm > Accessed 5
November 2012
Solem, A. 1985. Origin and diversification of
pulmonate land snails. Pages 269-290 in E.R. Trueman and M.R.
Clarke, editors. The Mollusca, Volume 10: Evolution. Academic Press,
New York and London. 90-91; 186-194
Tompa, A. S 1984. Land snails (Stylommatophora).
Pages 48-126 in A.S Tompa and et al, editors. The Mollusca, Volume
7: Reproduction. Academic Press, New York and London.
Wolfram Alpha <URL:
www.wolframalpha.com/input/?i=helix > Accessed 5 November 2012