Hernández Tamacas, M.A. and Delgado de Hernández, J.I. 2023. Material in Virtual Platforms and its impact on learning and course perception. Anuario de Investigación: Universidad Católica de El Salvador. 12, 1 (Aug. 2023), 55–61. DOI:https://doi.org/10.5377/aiunicaes.v12i1.16625.