SIWEK, Andrzej; TRAFAS-WOŁOSZYN, Magdalena. Hammershus Castle - "Good Practices" and Managing Permanentl Ruin. Protection of Cultural Heritage, [S. l.], n. 6, p. 163–176, 2018. DOI: 10.35784/odk.883. Disponível em: https://ph.pollub.pl/index.php/odk/article/view/883. Acesso em: 5 may. 2024.