Academic Article: 

Osborn, S. G., Vengosh, A., Warner, N. R., & Jackson, R. B. (2011). Methane contamination of drinking water accompanying gas-well drilling and hydraulic fracturing. Proceedings of the National Academy of Sciences of the United States of America, (108) 20. Retrieved from https://nicholas.duke.edu/cgc/pnas2011.pdf

Magazine Article:

Bateman, Christopher. (2010, June 21). “A Colossal Fracking Mess: The Dirty Truth Behind the New Natural Gas,” Vanity Fair, http://www.vanityfair.com/news/2010/06/fracking-in-pennsylvania-201006

Newspaper Article:

Johnson, Kirk. (2011, December 8).“E.P.A. Links Tainted Water in Wyoming to Hydraulic Fracturing for Natural Gas” The New York Times.  Retrieved from http://www.nytimes.com/2011/12/09/us/epa-says-hydraulic-fracturing-likely-marred-wyoming-water.html

Website:

Anonymous (2015 March 3). “The Urgent Case for a Ban on Fracking”. https://www.foodandwaterwatch.org/insight/urgent-case-ban-fracking