Sustainable tourism activities in Green Star hotels: A research in Europe. COLUMELLA – Journal of Agricultural and Environmental Sciences, [S. l.], v. 8, n. 2, p. 11–16, 2021. DOI: 10.18380/SZIE.COLUM.2021.8.2.11. Disponível em: https://journal.uni-mate.hu/index.php/columella/article/view/2805.. Acesso em: 21 may. 2024.