Chordata Phylum: The Pig
Lundberg, John G. 1995. Chordata. Version 01 January 1995. http://tolweb.org/Chordata/2499/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/ Net Industries. 2008. 18 April 2008. <a href="Pigs" >http://science.jrank.org/pages/5229/Pigs.html">Pigs - Species Of Pigs, The Domestic Pig</a> "Domestic Pig." Wikipedia.org. 19 May 2008. 2008. http://en.wikipedia.org/wiki/Domestic_Pig
