López-Arellano, H., Vélez-Salazar, M. and Franco-López, J.A. (trans.) (2017) “Perceptions of High School Principals about Teacher Motivation in in the Metropolitan Area of Medellin, 2015”, Revista Electrónica Educare, 21(2), pp. 1–23. doi:10.15359/ree.21-2.5.