1. International Energy Agency (IEA). World energy outlook, 〈http://www.iea.org//textbase/nppdf/free/2004/weo2004.pdf〉; 2004.
2. Turkey Environment Foundation Publication. Renewable energy sources in Turkey, 2006. p. 368.
3. International Energy Agency (IEA). Key world energy statistics, 〈http://www.iea.org/textbase/nppdf/free/2006/key2006.pdf〉; 2007.
4. Humankind's detour toward sustainability: past, present and future of renewable energies and electric power generations;Edinger;Renew Sustain Energy Rev,2000
5. Renewable Energy Policy Network for the 21st Century (REN21). Renewables 2005. Global status report, 〈http://www.ren21.net/globalstatusreport/download/RE_GSR_2006_Update.pdf〉; 2006.