ROK, Artur. Castle in Siewierz. Preservation and revalorisation of the historic ruins. Protection of Cultural Heritage, [S. l.], n. 6, p. 153–162, 2018. DOI: 10.35784/odk.882. Disponível em: https://ph.pollub.pl/index.php/odk/article/view/882. Acesso em: 8 may. 2024.