1. European Commission, Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Region – COM(2011) 571 Final – Roadmap to a Resource Efficient Europe, Brussels, 20.9.2011.
2. Energy incidence of historic building: leaving no stone unturned;Fabbri;J. Cult. Heritage,2013
3. World Development Indicators 2012, World Bank-Free PDF;W.B.D.D. Group,2012
4. Key World Energy Statistics—2012;IEA,2012
5. Council of Europe, Convention for the protection of the architectural heritage of Europe, Granada, 3.10.1985.