499731 Seifried, D., & Witzel, W. (2010). Renewable energy: The facts. London ; Washington, DC : Earthscan.
Cita Chicago (17th ed.)499731 Seifried, Dieter, i Walter Witzel. Renewable Energy: The Facts. London ; Washington, DC : Earthscan, 2010.
Cita MLA (9th ed.)499731 Seifried, Dieter, i Walter Witzel. Renewable Energy: The Facts. London ; Washington, DC : Earthscan, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.