Issues of sub-national referendums regulated at the national level

Art.2, art. 7 ofthe Law on Local Referendum

http://isap.sejm.gov.pl/DetailsServlet?id=WDU20000880985 (in Polish - the Parliament’s website)

Article 170 of the Constitution

Members of aself-governing community may decide, by means of a referendum, mattersconcerning their community, including the dismissal of an organ of localgovernment established by direct election. The principles of and procedures forconducting a local referendum shall be specified by statute.

http://www.sejm.gov.pl/prawo/konst/angielski/kon1.htm (in English - the Parliament’s website)