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"Aristotle (384-322 B.C.E.)." Aristotle. N.p., n.d. Web. 09 Dec. 2013.
"History of Classification." The History Of Scientific Classification. N.p., n.d. Web. 10 Dec. 2013.
"Panthera." Panthera. N.p., n.d. Web. 10 Dec. 2013.
"Five Kingdom Classification System." Five Kingdom Classification System. N.p., n.d. Web. 09 Dec. 2013.
"Eubacteria." Eubacteria. N.p., n.d. Web. 11 Dec. 2013.
"The Six Kingdoms." The Six Kingdoms. N.p., n.d. Web. 09 Dec. 2013
"Kingdoms!" Kingdoms. Notelek Development, n.d. Web. 11 Dec. 2013.
"Phloem vs Xylem." - Difference and Comparison. N.p., n.d. Web. 12 Dec. 2013.
"The Nephridia of Annelids, Nemertines, Flatworms, and Rotifers." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 17 Dec. 2013.
"How Do Gymnosperms Excrete?" AnswerParty. N.p., n.d. Web. 17 Dec. 2013.
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