León Martínez, Jorge León Martínez, et al. “Recursos Educativos Abiertos: Valiosos E Imprescindibles”. Perspectives on Education Without Barriers or Limits: A Tribute to the Master Lorenzo García Aretio, Sello Editorial UNAD, 2021, pp. 300-11, https://doi.org/10.22490/9789586518260.4.6.