RUSAKIEWICZ, Monika. The murder of Warcisław I in documents and historiography from the twelfth to sixteenth centuries. Studia z Dziejów Średniowiecza, [S. l.], n. 22, p. 194–205, 2018. DOI: 10.4467/25442562SDS.18.013.9815. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/stzdsr/article/view/3893. Acesso em: 25 sie. 2024.