1. Act of 20 May 2016 on Energy Efficiency. Journal of Laws 2016, Item 831;United Nations
2. 2018 Global Status Report: Towards a Zero-Emission, Efficient and Resilient Buildings and Construction Sector
https://wedocs.unep.org/20.500.11822/27140
3. Europe’s Buildings under the Microscope. A Country-by-Country Review of the Energy Performance of Buildings
https://www.bpie.eu/publication/europes-buildings-under-the-microscope
4. Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the Energy Performance of Buildings
https://eur-lex.europa.eu/legal-content/PL/TXT/PDF/?uri=CELEX:32010L0031&from=EL
5. Directive 2018/844 of the European Parliament and of the Council of 30 May 2018 Amending Directive 2010/31/EU on the Energy Performance of Buildings and Directive 2012/27/EU on Energy Efficiency
http://data.europa.eu/eli/dir/2018/844/oj