Krajniak, Radosław. “Alojzy Szudrowicz, The Kruszwica Chapter on the Thousandth Anniversary of the Establishment of the Bishopric in Kruszwica, Pejzaż Publishing House, Kruszwica-Bydgoszcz 2013”. Our Past 126 (December 30, 2016): 441–446. Accessed September 18, 2025. https://ojs.academicon.pl/np/article/view/4115.