León-León, Giselle, and Adriana Zúñiga-Meléndez. 2019. “Pedagogical Mediation and Scientific Knowledge Using a Sample of Ninth Grade Science Teachers in Two School Districts of the Costa Rica Educational System for the Development of Scientific Competencies”. Revista Electrónica Educare 23 (2), 1-24. https://doi.org/10.15359/ree.23-2.5.