GAWLICKI, Marcin. Conservation of the castle hill in Gniew in the years 1961–2011. Half a century in the history of the monument. Protection of Cultural Heritage, [S. l.], n. 18, p. 127–148, 2023. DOI: 10.35784/odk.3373. Disponível em: https://ph.pollub.pl/index.php/odk/article/view/3373. Acesso em: 12 dec. 2024.