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<http://www.scumdoctor.com/anatomy/circulatory-system/List-Of-Diseases-Of-The-Circulatory-System.html>.
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Causes, Treatment - MedicineNet." MedicineNet. Web. 08 May 2012.
<http://www.medicinenet.com/high_blood_pressure/article.htm>.
Weeg, Patricia A. "The Circulatory System." The Circulatory System. Web.
08 May 2012. <http://www.globalclassroom.org/hemo.html>.
"Parts of the Circulatory System." ThinkQuest. Oracle Foundation. Web. 08
May 2012. <http://library.thinkquest.org/28807/data/circ1.htm>.
World Book. Vol. 4. Chicago: Create a Space.
World Book. Vol. 1. Chicago: Create a Space