1. Evaluating the energy consumed for water use in the United States;Sanders,2012
2. Global Risk. 8th edition, An Initiative of the Risk Response Network. Lee Howell World Economic Forum Editor in Chief, ; 2013 [accessed 08.11.16].
3. Freshwater: Supply Concerns Continue, and Uncertainties Complicate Planning. GAO-14-430. Published May 20, 2014. Publicly released May 22, 2014.
4. Source of Green House Gas Emission. EPA, ; date [accessed 12.11.16].