SZYMBORSKI, Wiktor. Medieval Rome in Poland – Indulgences of the Churches of the City [of Rome] and Jubilee Indulgences in Medieval Poland. Bulletin of the Polish Historical Mission. Online. 13 October 2015. No. 10, pp. 397-424. [Accessed 3 July 2025]. DOI 10.12775/BPMH.2015.015.