Michał Kaźmierczak, Poniatowa unofficial site 11 Mart 2009 tarihinde Wayback Machine sitesinde arşivlendi. with links to History and Gallery of photographs. Retrieved November 15, 2012. Location of Poniatowa factory.
Michał Kaźmierczak, Poniatowa unofficial site 11 Mart 2009 tarihinde Wayback Machine sitesinde arşivlendi. with links to History and Gallery of photographs. Retrieved November 15, 2012. Location of Poniatowa factory.