Sari, Nilam, Heryanto Heryanto, Lorena Peranginangin, and Renatal Halomoan Lumban Tobing. 2024. “The Contribution of Problem-Solving Ability To Self-Regulated Learning of Khairul Imam Medan Middle School Students”. Mathline : Jurnal Matematika Dan Pendidikan Matematika 9 (3):887-98. https://doi.org/10.31943/mathline.v9i3.645.