Yulianda Putri Rahmawati, Mohammad Salehudin. Optimalisasi pembelajaran abad 21 pada SMP dan SMA. J. Instr. Dev. Res. [Internet]. 2021Dec.31 [cited 2025Oct.22];1(3):112-2. Available from: https://journal.iel-education.org/index.php/JIDeR/article/view/67