Castaneda, Héctor, and John Richard Stepp. 2007. “Ethnoecological Importance Value (EIV) Methodology: Assessing the Cultural Importance of Ecosystems As Sources of Useful Plants for the Guaymi People of Costa Rica”. Ethnobotany Research and Applications 5 (December):249-57. https://ethnobotanyjournal.org/index.php/era/article/view/135.