Izzati, Nanda Nur, and Nuriana Rachmani Dewi. “Development of STEAM-Based Mathematics Teaching Materials on Direct and Inverse Proportion to Improve Mathematical Problem-Solving Ability and Self Regulated Learning”. Unnes Journal of Mathematics Education 12, no. 1 (May 16, 2023): 51-59. Accessed July 19, 2024. https://journal.unnes.ac.id/sju/ujme/article/view/68735.