GRACZYK, W. he historicity of the first bishops of Płock in the light of the beginnings of diocese. Saeculum Christianum. Historical Writings, [S. l.], v. 21, n. 1, p. 73–80, 2021. Disponível em: https://czasopisma.uksw.edu.pl/index.php/sc/article/view/7943. Acesso em: 22 jul. 2024.