Bibliography

     McFarland, Kenneth [Internet] Botany 111 Fall 2013. [cited 10/28/13]. Available from http://botany1112013.blogspot.com/

     Pennak, Robert. Fresh-Water Invertebrates of the United States. 1989. Wiley-Interscience Publication. 629.

    Lee, John J., Hunter, Seymour H., Bovee, Eugene C. An Illustrated Guide to the Protozoa. 1985. Allen Press, Inc. 628.