Andrés Jiménez C, Anchetta Meza G. Education elements in textbooks at UNED, Costa Rica, 2017 and 2018: use frequency and improve possibilities. URJ [Internet]. 2020 May 25 [cited 2024 Apr. 23];12(1):e2913. Available from: https://revistas.uned.ac.cr/index.php/cuadernos/article/view/2913