Yulianda Putri Rahmawati, and Mohammad Salehudin. “Optimalisasi Pembelajaran Abad 21 Pada SMP Dan SMA”. Journal of Instructional and Development Researches 1, no. 3 (December 31, 2021): 112-122. Accessed March 12, 2026. https://journal.iel-education.org/index.php/JIDeR/article/view/67.