Steger, U. (2005). Sustainable development and innovation in the energy sector. Springer.
Lua i Stíl Chicago (17ú heag.)Steger, Ulrich. Sustainable Development and Innovation in the Energy Sector. Berlin: Springer, 2005.
Lua MLA (8ú heag.)Steger, Ulrich. Sustainable Development and Innovation in the Energy Sector. Springer, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.