1. Ministerio de Industria, E. Y. T. E. Consumos del Sector Residencial en España Resumen de Información Básicahttp://www.idae.es/uploads/documentos/documentos_Documentacion_Basica_Residencial_Unido_c93da537.pdf
2. EU Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the Energy Performance of Buildings (recast)https://www.me.government.bg/en/library/directive-2010-31-eu-of-the-european-parliament-and-of-the-council-of-19-may-2010-on-the-energy-perf-171-c80-m262-1.html
3. EU Directive 2012/27/EU of the European Parliament and of the Council of 25 October 2012 on Energy Efficiencyhttp://www.buildup.eu/en/practices/publications/directive-201227eu-european-parliament-and-council-25-october-2012-energy
4. European Commission Renewable Energy Directive (2009/28/EC)https://ec.europa.eu/energy/en/topics/renewable-energy
5. EU Commission Commision Recommendation (EU) 2016/1318 Guidelines for the Promotion of nZEBhttp://www.buildup.eu/en/practices/publications/recommendation-eu-20161318-guidelines-promotion-nearly-zero-energy-buildings