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<http://yuck.discovery.com/flash/body/pg000138.html>.

Whittemore, Susan. The Respiratory System. New York: Chelsea House, 2003.

How David Blaine Held His Breath." Time Health & Science. Time magizane. 5 Dec. 2008 <http://www.time.com/time/health/article/0,8599,1736834,00.html>.

Citation added: "Respiratory system." Net working for health. Medindia. 8 Jan. 2009 <http://www.medindia.net/know_ur_body/ressystem.asp>

.Citation added: "Inside the Human Body - The Respiratory System - Grades 7-12 - Respiratory System." Canadian Lung Association - asthma, emphysema, COPD, tuberculosis, sleep apnea, lung diseases, tobacco, quitting smoking, air pollution. 08 Jan. 2009 <http://lung.ca/children/grades7_12/respiratory/respiratory_system.html>.