Salamanca - Garay, Ignacio, and Emilio Sagredo - Lillo. 2024. “Design and Validation of a Perception Instrument for Educational Communities on the Stimulation of 21st- Century Skills in Students Within the School System”. European Public & Social Innovation Review 10 (September). España:1-16. https://doi.org/10.31637/epsir-2025-883.