Ćwikła, Łukasz. “In the Question of the Death of Peter (III) Wspinek from Będków (castellan in Brzeziny) in 1521”. Acta Universitatis Lodziensis. Folia Historica, no. 100 (April 30, 2018): 31–43. Accessed December 5, 2025. https://czasopisma.uni.lodz.pl/historica/article/view/2774.