Sierżęga, Paweł. “Antoni Prochaska’s Letters to Aleksander Semkowicz (1876–1887) in Teofil Emil Modelski’s Private Collection”. Galicja. Studia i materiały, no. 6 (December 15, 2020): 527–593. Accessed December 5, 2025. https://journals.ur.edu.pl/galisim/article/view/5014.