“Análisis De Plataformas Educativas Digitales Comerciales españolas Destinadas a Educación Primaria Analysis of Spanish Commercial Digital Educational Platforms for Primary Education”. Revista Latinoamericana De Tecnología Educativa - RELATEC, vol. 16, no. 2, Dec. 2017, pp. 49-62, https://doi.org/10.17398/1695-288X.16.2.49.