1. Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast), Official Journal of the European Union, http://eur-lex.europa.eu/eli/dir/2010/31/oj
2. Regulation of Minister of Infrastructure and Economic Development (21 February, 2015) on the methodology for determining the energy performance of building or part of the building and energy performance certificates. (in Polish)
3. PN-EN ISO 6946 Building components and building elements – Thermal resistance and thermal transmittance – Calculation methods (in Polish)
4. PN-EN ISO 13370:2007 Thermal performance of buildings – Heat transfer via the ground — Calculation methods (in Polish)
5. PN-EN ISO 13790:2008 Energy performance of buildings – Calculation of energy use for space heating and cooling (in Polish)