DIVERSIFYING THE LEVEL OF SUSTAINABLE DEVELOPMENT IN POLAND AND SELECTED COUNTRIES OF THE EUROPEAN UNION. Research Bulletins of the Faculty of Economic Sciences, [S. l.], v. 1, n. 23, p. 139–158, 2019. Disponível em: https://ezeszyty.wne.tu.koszalin.pl/index.php/zeszyty/article/view/148. Acesso em: 19 jul. 2025.