Husain, Risal, Muslimin Muslimin, and Ratman. 2025. “Development of Problem Based  Learning LKPD to Improve Critical Thinking and Collaboration Skills Students in Junior High School”. International Journal of Education, Humaniora, and Social Studies 2 (2): 52-59. https://doi.org/10.63895/j30321271.2025.v2.i2.pp52-59.