1. Energy in Figures -Statistical Pocketbook,2015
2. National Energy Balance Data,2016
3. EU Building Stock Observatory,2016
4. Evaluation of Directive 2010/31/EU on the Energy Performance of Buildings, Commission Staff Working Document,2016
5. Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the Energy Performance of Buildings.