Sari, N, A Fauan, and H Syarifuddin. “The Development of Learning Materials Based on Guided Discovery to Improve the Student’s Ability in Mathematical Problem Solving on Second Semester at Grade VIII of Junior High School”. KnE Social Sciences 3, no. 15 (March 31, 2019): 115–126. Accessed April 28, 2024. https://knepublishing.com/index.php/KnE-Social/article/view/4359.