Dinelti Fitria, Lufri L, Elizar E, Ali Amran. 21st Century Skill-Based Learning (Teacher Problems In Applying 21st Century Skills). IJHESS [Internet]. 2023 Feb. 27 [cited 2025 Dec. 4];2(4). Available from: https://ijhess.com/index.php/ijhess/article/view/409