F. Sepúlveda, P. Céspedes, J. Ovalle, and D. García , Trans., “Scale Adaptation and Validation to Assess the Development of 21st Century Skills in Secondary School Students”, Rev. Electr. Educare, vol. 27, no. 3, pp. 1–22, Nov. 2023, doi: 10.15359/ree.27-3.17251.