References



Meglitsch, P. 1972. Invetebrae zoology. Oxford University Press, Inc. New York, N.Y., USA



Buchsbaum, R. and Milne, L.J. 1960. The lower animals: living invertebrates of the world. Doubleday & Company, Inc. Garden City, New         York, USA.



Moore, J. 2006. Introduction to the invertebrates. Cambridge University Press, Cambridge, UK

Pearse, V. and Buchsbaum, M. 1987. Living invertebrates. The Boxwood Press. Pacific Grove, California, USA

Grzimek, B. 1974. Animal life encyclopedia. Van Nostrand Reinhold Company, New York, N.Y., USA


Mann, K. H. 1961. Leeches (Hirudinea) Their structure, physiology, ecology, and embryology. Pergamon Press, New York, N.Y., USA

 Whitaker, I.S, Rao, J., Izadi,D and Butler, P.E. 2004. Historical Artical: Hirudo medicinalis: ancient orgigins of, and trends in the use of       medicinal leeches throughout history  <URL:http://drantoniocmf.com/Anatomia/Historia%20de%20las%20sanguijuelas%20en%20medicina.pdf>. Accessed 9 April 2011.


Freshwaterlife 2009. <URL:http://species.freshwaterlife.org/index/fish-parasites/Hirudinea/hirudo-medicinalis.html> Accessed 9 April 2011


Silverstein, K. 2002. "Hirudo medicinalis" (On-line), Animal Diversity Web.
<URL:http://animaldiversity.ummz.umich.edu/site/accounts/information/Hirudo_medicinalis.html> Accessed 12 April 2011

Ginsberg, D. and Burch, J. 1998. Natural History of Leeches (Annelida: Hirudinea)                                              <URL:http://wwwpersonal.umich.edu/~davegins/leech.html> Accessed 12 April 2001





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