Aguirre, Patricia, Jacqueline Scholz, and Johanna Morocho. “Evaluation of Sustainability Standards in the Hotel Sector of the Biosphere Reserve Sumaco in the Amazon Region of Ecuador”. Ceiba 51, no. 2 (June 12, 2013): 61–69. Accessed December 6, 2025. https://camjol.info/index.php/CEIBA/article/view/1106.