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