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Great, Joel. "Parts of the Respiratory System and their Functions ." Get Paid to Write Articles | Make Money Online - Expertscolumn.com. N.p., n.d. Web. 5 May 2012. <http://expertscolumn.com/content/parts-respiratory-system-and-their-functions>.
"How Do All Systems Interact." PDF Document. N.p., n.d. Web. 2 May 2012. <http://www.rsd.edu/schools/carmichael/masters/pdf/hwsystmswrky.pdf>.
MissBol416. "Body Systems And Homeostasis." Upload & Share PowerPoint presentations and documents. N.p., n.d. Web. 2 May 2012. <http://www.slideshare.net/MissBol416/body-systems-and-homeostasis>.
"resboth2." ThinkQuest : Library. N.p., n.d. Web. 3 May 2012. <http://library.thinkquest.org/11965/html/cyber-anatomy_resboth2.html>.
"Bronchitis." Magill's Medical Guide Volume 1 : A - Cor / 1 - 628.. 4th rev. ed. Pasadena, Calif: Salem Press, 2008. 407-408. Print.
Magill's Medical Guide Volume 2 : Cor-Hep 628-936. 4th rev. ed. Pasadena, Calif: Salem Press, 2008. Print.