Sari, N., H. Heryanto, L. Peranginangin, and R. H. L. . Tobing. “The Contribution of Problem-Solving Ability To Self-Regulated Learning of Khairul Imam Medan Middle School Students”. Mathline : Jurnal Matematika Dan Pendidikan Matematika, vol. 9, no. 3, Aug. 2024, pp. 887-98, doi:10.31943/mathline.v9i3.645.