Rahayu S, Fauzan A, Yerizon Y, Arnawa IM. The Development of Learning Device Based on Cognitive Conflict to Improve Mathematics Problem Solving Skills for Students in Madrasah Tsanawiyah. jg [Internet]. 2022Aug.30 [cited 2024Dec.22];7(1):91-8. Available from: https://ojs.umrah.ac.id/index.php/gantang/article/view/4416