"Carl Wilhelm Scheele." Wikipedia. Wikimedia Foundation, 30 Nov. 2014. Web. 09 Dec. 2014."Chlorine - Cl." Chlorine (Cl). LENNTECH, 2014. Web. 07 Dec. 2014."Chlorine - Cl." Chlorine (Cl). CDC, 10 Apr. 2013. Web. 07 Dec. 2014.