1. Renewable Energy Sources for Sustainable Development;Rathore,2007
2. British Petroleum [Internet]. Annual review 2006 [cited 2007 Oct 8]. Available from: http://www.bp.com/content/dam/bp/pdf/investors/bp-annual-review-2006.pdf.
3. Energy Assessment 2000: Energy and the Challenge of Sustainability;UNDP,2000
4. Geothermal energy for the benefit of the people;Fridleifsson;Renew. Sustain. Energy Rev.,2001
5. Nuclear Power [Internet];Energy Information Administration, Department of Energy, US Nuclear Regulatory Commission, Congressional Research Service, World Nuclear Association,2015