1. Directive of the European parliament 2001/77/ES. http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2001:283:0033:0040:EN:PDF [retrieved on 12.01.10].
2. Directive of the European parliament and Commission 2003/54/ES. http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2003:176:0037:0055:EN:PDF [retrieved on 12.01.10].
3. The law656/2004 of 26 October 2004. http://www.economy.gov.sk/zakon-c-656-2004-zz–o./128236s [in Slovak, retrieved on 21.01.10].
4. The law 657/2004 of 26 October 2004. http://www.economy.gov.sk/zakon-o-tepelnej-energetike./128085s [in Slovak, retrieved on 21.01.10].
5. The law 476/2008 of 4 November 2008. http://www.sea.gov.sk/energeticke_aktivity/legislativa_predpisy_sr/zak_476_2008.pdf [in Slovak, retrieved on 21.01.10].