1. Rinkesh, https://www.conserve-energy-future.com/different-energy-sources.php
2. Environmental Impact Assessment; International Energy Outlook 2013.
3. Wikipedia: World Energy Consumption
4. U.S. Department of Energy, (July 2004). “Energy efficiency and renewable energy hydropower” http://hydropower.inel.gov/techtransfer/pdfs/34916.pdf
5. “Sustainability of Ground-Water Resources”, USGS Circular 1186 https://water.usgs.gov/edu/hydroadvantages.html