Bibliography:

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

 Raven, Peter H., Ray Franklin. Evert, and Susan E. Eichhorn. Biology of Plants. New York: W.H. Freeman and, 2013. Print.

  Patterson, D. J. 1996. Free-living Freshwater Protozoa, A Colour Guide. 5th impression. 2013. Manson Publishing.