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2. International Energy Agency: „World Energy Outlook 2010“. Paris: IEA Publications, 2010.
3. Joint Research Center (JRC) der Europäischen Kommission: European Life Cycle Database. Ispra: JRC, 2010.
4. PE International: Datenbank der Ökobilanzsoftware GaBi Stuttgart: PE International, 2011.
5. International Organization for Standardization: ISO14040: Environmental management – Lifecycle Assessement – Principles and Framework. 2. Aufl. Genf: International Organization for Standardization, 2009.