1. Wikipedia, 12th August 2010, http://en.wikipedia.org/wiki/Circulatory_system.
2. Think Quest, 12th August 2010, http://library.thinkquest.org/5777/cir1.htm.
3. Science Clarified, 13th August 2010, http://www.scienceclarified.com/Ci-Co/Circulatory-System.html.
4. Google Docs, 13th August 2010, http://www.docs.google.com/.
5. Gobal Classroom, 17th August 2010, http://www.globalclassroom.org/hemo.html.
6. Buzzle, 20th August 2010, http://www.buzzle.com/articles/how-does-the-circulatory-system-work.html.
7. Youtube, 18th August 2010, http://www.youtube.com/.
8. Healthy Way Magazine, 23rd August 2010, http://www.healthywaymagazine.com/issue27/04_circulatory_system.html
9. Ivy-Rose, 20th August 2010, http://www.ivy-rose.co.uk/HumanBody/Blood/Heart_Functions.php.
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