Roman, Kisiel, and Jarzębowicz Natalia. “NON-AGRICULTURAL BUSINESS ACTIVITY IN THE OLECKO DISTRICT”. Journal of Agribusiness and Rural Development 46, no. 4 (December 31, 2017): 787–794. Accessed May 4, 2024. http://www1.up.poznan.pl/jard/index.php/jard/article/view/132.