<ul><li><a href=https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1457601461953&uri=CELEX:02013R0952-20131030 target=_blank>Regulation (EU) No 952/2013 on the Union Customs Code(Regulation (EU) No 952/2013 laying down the Union Customs Code, OJ L 269, p.1, adopted on 10 October 2013, last updated on 30 September 2016,   Article 211)</a></li><li><a href=https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20040680622 target=_blank>Custom Act(Ustawa Prawo Celne, Dz.U. 2004 Nr 68 poz. 622, 19 March 2004, last updated on 1 December 2015, Chapter 6, Article 80 )</a></li><li><a href=https://www.podatki.gov.pl/clo/agenci-celni/#:~:text=Wniosek%20o%20wpis%20na%20list%C4%99,.puesc.gov.pl. target=_blank>Entry on the list of customs agents</a></li></ul>