499731 Seifried, D., & Witzel, W. (2010). Renewable energy: The facts. London ; Washington, DC : Earthscan.
Lua i Stíl Chicago (17ú heag.)499731 Seifried, Dieter, agus Walter Witzel. Renewable Energy: The Facts. London ; Washington, DC : Earthscan, 2010.
Lua MLA (9ú heag.)499731 Seifried, Dieter, agus Walter Witzel. Renewable Energy: The Facts. London ; Washington, DC : Earthscan, 2010.
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