Ugalde Hernández, Oscar. Political Economy of Fair Trade and Development Theory: Implications in the Costa Rican Coffee Market (1990-2017). Relaciones Internacionales 92, no. 2 (octubre 1, 2019): 13-32. Accedido mayo 25, 2020. https://www.revistas.una.ac.cr/index.php/ri/article/view/12483.