Septiyanti SNA, Nugraha I, Kurnia A. INVESTIGATING THE CHALLENGES FACED BY EFL TEACHERS IN DEVELOPING STUDENTS’ 4C SKILLS IN 21ST CENTURY EDUCATION. EEAL [Internet]. 2023 Jul. 19 [cited 2025 Jun. 4];6(2):87-101. Available from: https://journal.institutpendidikan.ac.id/index.php/eeal/article/view/49