Biassoli, Eleonora, Manuela Rosa, and Valentina Tocchioni. “The Impacts of Green Key Certification on Tourism Enterprises in the Algarve”. Journal of Tourism, Sustainability and Well-being 14, no. 2 (June 30, 2026): 73–88. Accessed June 30, 2026. https://journals.cinturs.pt/jtsw/article/view/530.