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Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, 27 Jan. 2014. Web. 30 May 2014.
"What Is Polio?" Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, 03 Sept. 2013. Web. 29 May 2014.
Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, 27 Jan. 2014. Web. 30 May 2014.
"What Is Polio?" Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, 03 Sept. 2013. Web. 29 May 2014.