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"Chlorofluorocarbons." Columbia Electronic Encyclopedia. Columbia University Press, 2012. Web. 09 Apr. 2014. <http://www.infoplease.com/encyclopedia/science/chlorofluorocarbons.html>.
"Ozone Protection." A Walk Through History. US Environmental Protection Agency, n.d. Web. 9 Apr. 2014. <http://www.epa.gov/ozone/downloads/timeline_poster_11x17.pdf>.
"History of Chlorofluorocarbons (CFCs) as Refrigerants." UGA. Zwhudson, n.d. Web. 9 Apr. 2014. <http://zwhudson.myweb.uga.edu/chem8290/replacement%20of%20CFCs%20as%20refrigerants.htm>
"Brief Questions and Answers on Ozone Depletion." EPA. Environmental Protection Agency, n.d. Web. 09 Apr. 2014. <http://www.epa.gov/ozone/science/q_a.html>.
"A Comprehensive Guide to Stratospheric Ozone Depletion." Ozone Depletion. N.p., n.d. Web. 9 Apr. 2014. <http://www.ozonedepletion.info/education/part3/fig16.gif>.
Ramanathan, V (1975). "Greenhouse Effect Due to Chlorofluorocarbons: Climatic Implications". Science, New Series 19: 50–52. JSTOR 1740877
"Health and Environmental Effects of Ozone Layer Depletion." EPA. Environmental Protection Agency, n.d. Web. 09 Apr. 2014. <http://www.epa.gov/spdpublc/science/effects/index.html>.
"B.C. Air Quality." The Impacts of Ozone Depletion. Government of B.C., n.d. Web. 09 Apr. 2014. <http://www.bcairquality.ca/101/ozone-depletion-impacts.html>.