Aguirre P, Scholz J, Morocho J. Evaluation of Sustainability Standards in the Hotel Sector of the Biosphere Reserve Sumaco in the Amazon Region of Ecuador. Ceiba [Internet]. 2013 Jun. 12 [cited 2025 Dec. 6];51(2):61-9. Available from: https://www.camjol.info/index.php/CEIBA/article/view/1106