Wasik, Bogusz. “The Origins of the Teutonic Order’s Castles in Chełmno Land. First Strongholds and Mortared Structures”. Archaeologia Historica Polona 24 (July 25, 2017): 233–360. Accessed July 18, 2024. https://apcz.umk.pl/AHP/article/view/AHP.2016.011.