BUKS, Joanna. Competitiveness of Polish agriculture in terms of regional. Bulgarian Journal of Agricultural Economics and Management, Sofia, BG, v. 56, n. 3-4, p. 102–108, 2011. Disponível em: https://agriacad.eu/ojs/index.php/bjaem/article/view/4237.. Acesso em: 4 oct. 2026.