1. EU Energy in Figures—Statistical Pocketbook 2012https://ec.europa.eu/energy/sites/ener/files/documents/2012_energy_figures.pdf
2. EU Energy in Figures—Statistical Pocketbook 2014http://ec.europa.eu/energy/sites/ener/files/documents/2014_pocketbook.pdf
3. Greenhouse Gas Emissions by Industries and Householdshttp://ec.europa.eu/eurostat/statistics-explained/index.php/Greenhouse_gas_emissions_by_industries_and_households
4. Buildings and Climate Change: Summary for Decision-Makershttp://www.unep.org/sbci/pdfs/SBCI-BCCSummary.pdf
5. Technology Roadmap: Solar Heating and Coolinghttps://www.iea.org/publications/freepublications/publication/Solar_Heating_Cooling_Roadmap_2012_WEB.pdf