"Contactنسخة محفوظة 2008-06-28 على موقع واي باك مشين.." Ministry of Infrastructure. Retrieved on 14 January 2011. "Ministry of Infrastructure 4/6 Chałubiński Street, 00-928 Warsaw." Address in Polish: "ul. Chałubińskiego 4/6, 00–928 Warszawa"
mi.gov.pl
"Contactنسخة محفوظة 2008-06-28 على موقع واي باك مشين.." Ministry of Infrastructure. Retrieved on 14 January 2011. "Ministry of Infrastructure 4/6 Chałubiński Street, 00-928 Warsaw." Address in Polish: "ul. Chałubińskiego 4/6, 00–928 Warszawa"
web.archive.org
"Contactنسخة محفوظة 2008-06-28 على موقع واي باك مشين.." Ministry of Infrastructure. Retrieved on 14 January 2011. "Ministry of Infrastructure 4/6 Chałubiński Street, 00-928 Warsaw." Address in Polish: "ul. Chałubińskiego 4/6, 00–928 Warszawa"