Kwaśny, Zbigniew. “Foreign Trade of the Free State of Kraków (in the Light of Reports from the Prussian Residents)”. Studia Historiae Oeconomicae 9, no. 1 (December 1, 1974): 141–160. Accessed November 5, 2026. https://pressto.amu.edu.pl/index.php/sho/article/view/57881.