1. Goal 7: Ensure Access to Affordable, Reliable, Sustainable and Modern Energy for Allhttp://www.un.org/sustainabledevelopment/energy/
2. Sustainable Development Knowledge Platformhttps://sustainabledevelopment.un.org/sdg7
3. Sustainable Energy for All and SDG 7 in Focushttps://irenanewsroom.org/2015/09/30/sustainable-energy-for-all-and-sdg-7-in-focus/
4. Climate Change 2014: Mitigation of Climate Change. Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change,2014
5. Physics of Solar Energy;Chen,2011