1. Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions Public procurement for a better environment {SEC(2008) 2124} {SEC(2008) 2125} {SEC(2008) 2126}https://www.uzp.gov.pl/__data/assets/pdf_file/0022/26518/KOM-2008-400_Zamowienia-publiczne-narzecz-poprawy-stanu-srodowiska.pdf (access: 16.04.2016)
2. Constitution of the Republic of Polandof 2 April 1997 (Journal of Laws No 78, item 483)
3. Act of 29 January 2004 -Public Procurement Law(Journal of Laws of 2015, item 2164)
4. Civil Codeod 23 April 1964 r. ( Journal of Laws No 16, item 93) text of 17 Februay 2016 r. ( Journal of Laws of 2016, item 380)