1. Europe's Energy Position: Markets and Supply. Market Observatory for Energy, Directorate General for Energy, REPORT 2009.
2. European Union Energy and Transport in Figures – 2009 Edition,2009
3. BREEAM, BRE Environmental Assessment Method, available at: http://www.breeam.org/.
4. HQE, Haute Qualité Environnementale, available at: http://www.certivea.com/assets/download/certification_HQE/en/a8a2d-Brochure-INTL-EN-V7.pdf and http://assohqe.org/hqe/.
5. DGNB, Deutsche Gesellschaft fuer Nachhaltiges Bauen, available at: http://www.dgnb.de/.