Jaedun‬, ‪Amat, Harto, S. P., Hastutiningsih, A. D., & Hasbi, H. (2022). Training effect on teacher ability to implement the 21st century skills in learning. Cypriot Journal of Educational Sciences, 17(9), 3516–3528. https://doi.org/10.18844/cjes.v17i9.8089