1. Estimated use of water in the United States in 2010;Maupin,2014
2. Groundwater Protection Council. Ground Water Report to the Nation: A Call to Action. http://www.gwpc.org/sites/default/files/files/GWR_Front%20Matter_Final.pdf. [Accessed 18 January 2017].
3. Estimated use of water in the United States in 2000;Hutson,2004
4. U.S. Geological Survey. National Brackish Groundwater Assessment. Program information Accessed on 8 February 2017 at https://water.usgs.gov/ogw/gwrp/brackishgw/study.html Fact sheet Accessed on 8 February 2017 at https://water.usgs.gov/ogw/gwrp/brackishgw/files/brackish_infosheet_v8.pdf.
5. Projecting water withdrawal and supply for future decades in the U.S. under climate change scenarios;Roy;Environ Sci Technol,2012