ERDOGAN, Nazmiye. SUSTAINABILITY IN TOURISM: ECOLABEL AND CERTIFICATION PROGRAMS AT HOTELS IN TURKEY. Challenges of Tourism and Business Logistics in the 21st Century, [S. l.], v. 1, n. 1, p. 20–27, 2018. Disponível em: https://js.ugd.edu.mk/index.php/YFNTS/article/view/2183. Acesso em: 5 sep. 2026.