WITKOWSKA, Karolina. Research on medieval building materials from Radzyń Chełmiński castle. Acta Universitatis Nicolai Copernici [Heritage Studies and Conservation Science]. Online. 19 June 2018. Vol. 48, pp. 37-56. [Accessed 5 July 2025]. DOI 10.12775/AUNC_ZiK.2017.002.