1. The future of energy http://www.bp.com/en/global/corporate/press/bp-magazine/issue-two-2013/the-future-of-energy.html 2013
2. BP Energy Outlook 2030 http://www.bp.com/content/dam/bp/pdf/statistical-review/EnergyOutlook2030/BP_Energy_Outlook_2030_PowerPoint.pptx 2013
3. 2013 World Energy Issues Monitor http://www.worldenergy.org/documents/2013_world_energy_issues_monitor_report_feb2013.pdf 2013
4. Global Energy Assessment-Towards a Sustainable Future http://www.iiasa.ac.at/web/home/research/Flagship-Projects/Global-Energy-Assessment/GEA-Summary-web.pdf 2013
5. Becquerel Photovoltaic Effect in Binary Compounds