PODGÓRSKI, Andrzej and TOMASZEWSKA-SZEWCZYK, Alina. Tortoiseshell, Bioorganic Material in Artistic Crafts – Issues of Material Science, Technology and Design Techniques, and Destruction. Acta Universitatis Nicolai Copernici [Heritage Studies and Conservation Science]. Online. 20 June 2016. Vol. 46, pp. 449-467. [Accessed 19 December 2025]. DOI 10.12775/AUNC_ZiK.2015.018.