Hendri H, Firdaus FM. The Effectiveness of Problem Based Learning in Improving the Cognitive Abilities of Elementary School Students. Juwara J. Wawasan dan Aksara [Internet]. 2026 May 7 [cited 2026 May 20];6(1):13-26. Available from: https://jurnal.smpharapanananda.sch.id/index.php/juwara/article/view/781