Aropiq, P. R., A. Nasrullah, and N. Yendra. “Enhancing Problem-Solving and Self-Directed Learning in 8th-Grade Students through a Problem-Based Learning Approach”. Progressive of Cognitive and Ability, vol. 4, no. 1, Jan. 2025, pp. 30-38, doi:10.56855/jpr.v4i1.1325.