Rahayu, Silvia, Ahmad Fauzan, Yerizon Yerizon, and I Made Arnawa. 2022. “The Development of Learning Device Based on Cognitive Conflict to Improve Mathematics Problem Solving Skills for Students in Madrasah Tsanawiyah”. Jurnal Gantang 7 (1):91-98. https://doi.org/10.31629/jg.v7i1.4416.