"Dzieñ Partnerstwa Miast"(PDF). chojnowska.e-informator.pl (in Polish). Gazeta Chojnówska. May 26, 2017. p. 3. Archived(PDF) from the original on October 10, 2019. Retrieved October 10, 2019.
"Dzieñ Partnerstwa Miast"(PDF). chojnowska.e-informator.pl (in Polish). Gazeta Chojnówska. May 26, 2017. p. 3. Archived(PDF) from the original on October 10, 2019. Retrieved October 10, 2019.