Vílchez Durán, C. P. “Methodology for Teaching Natural Sciences Used by Costa Rican Teachers at the Vesta, Jabuy and Gavilan Schools in the Cabécar Indigenous Community”. Revista Educación - Journal of Education, vol. 43, no. 1, Feb. 2019, pp. 451-67, doi:10.15517/revedu.v43i1.27673.