1. United Nations Development Programme. 〈http://www.undp.org/content/undp/en/home/ourwork/environmentandenergy/focus_areas/sustainable-energy.html〉 (accessed 23 October, 2012).
2. Role of renewable energy sources in environmental protection: a review;Panwar;Renewable and Sustainable Energy Reviews,2011
3. Social, economical and environmental impacts of renewable energy systems;Akella;Renewable Energy,2009
4. IPCC special report on renewable energy sources and climate change mitigation. Prepared by working group III of the intergovernmental panel on climate change;Intergovernmental Panel on Climate Change,2011
5. 100% renewable energy systems, climate mitigation and economic growth;Mathiesen;Applied Energy,2011