1. Eurostat. Measuring progress towards a more sustainable Europe. European Commission,
http://epp.eurostat.ec.europa.eu/cache/ITY_OFFPUB/KS-77-07-115/EN/KS-77-07-115-EN.PDF
2. European Commission: EUROPE 2020 A strategy for smart, sustainable and inclusive growth (2010)
3. European Environmental Agency,
http://www.eea.europa.eu/
4. International Energy Agency: Energy Efficiency Policy Recommendations Worldwide Implementation (2008)
5. Fraunhofer Gesellschaft: Energieeffizienz in der Produktion - Untersuchung zum Handlungs- und Forschungsbedarf (2008)