Witkowska-Dąbrowska, Mirosława. “Indicators of Sustainable Development of the Province of Warmia and Mazury in the Environmental Aspect”. Olsztyn Economic Journal 11, no. 3 (September 30, 2016): 299–309. Accessed November 23, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/2934.