FREZA-OLCZYK, Mariola. Bishop Conrad III of Kamień Pomorski: a common clergyman and a politician in the Duchy of Pomerania in 1233–1241. Studia z Dziejów Średniowiecza, [S. l.], n. 22, p. 67–81, 2018. DOI: 10.4467/25442562SDS.18.005.9807. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/stzdsr/article/view/3884. Acesso em: 29 kwi. 2024.