Andrés, C., G. Anchetta, Y. Barboza-Robles, and M. Peraza-Delgado. “Pedagogical Mediation Strategies of Educational Materials in the Costa Rican Distance Education University”. UNED Research Journal, vol. 12, no. 1, May 2020, p. e2940, doi:10.22458/urj.v12i1.2940.