Andrés Jiménez, C. and Anchetta Meza, G. 2020. Education elements in textbooks at UNED, Costa Rica, 2017 and 2018: use frequency and improve possibilities. UNED Research Journal. 12, 1 (May 2020), e2913. DOI:https://doi.org/10.22458/urj.v12i1.2913.