Cita APA

Seifried, D. A., & Witzel, W. A. (2010). Renewable energy-the facts.

Chicago Edition Citation

Seifried, Dieter; Author, i Walter; Author Witzel. Renewable Energy-the Facts. London, Earthscan, 2010.

Cita MLA

Seifried, Dieter; Author, i Walter; Author Witzel. Renewable Energy-the Facts. 2010.