Dall’Aglio, Francesco. “Between Rebellion and Statesmanship: Attempting a Biography of Ivanko, 1196/1200 (?)”. Studia Ceranea 11 (December 30, 2021): 91–106. Accessed May 14, 2024. https://www.czasopisma.uni.lodz.pl/sceranea/article/view/13140.