Twardowski, Bolesław. Listy Pasterskie Z Lat 1923-1939. Edited by Grzegorz Chajko. Vol. Historia, Hereditas, Ecclesia, Vol. 19. Historia, Hereditas, Ecclesia. Poland: Księgarnia Akademicka Publishing, 2022. Accessed January 1, 2026. https://books.akademicka.pl/publishing/catalog/book/389.