Pérez Pérez, Belén. “Sustainable Tourism, Ecotourism & ECST: Sierra Nevada (Spain)”. HUMAN REVIEW. International Humanities Review / Revista Internacional de Humanidades 12, no. 6 (December 14, 2022): 1–18. Accessed September 21, 2024. https://ojs.bdtopten.com/karim/index.php/revHUMAN/article/view/3995.