“Shades of Shade: Determinants of Conservation Practices in Coffee Plantations for Ecosystem Services Provision in Puerto Rico, a Preliminary Analysis”. Global Journal of Science Frontier Research 16, no. 19 (June 27, 2016): 1–30. Accessed November 1, 2026. https://www.journalofscience.org/index.php/GJSFR/article/view/.