Freza-Olczyk, M. 2018. Bishop Conrad III of Kamień Pomorski: a common clergyman and a politician in the Duchy of Pomerania in 1233–1241. Studia z Dziejów Średniowiecza. 22 (grudz. 2018), 67–81. DOI:https://doi.org/10.4467/25442562SDS.18.005.9807.