Url: https://www.researchgate.net/profile/Rustam-E-Simamora/publication/317416532_Improving_Learning_Activity_and_Students'_Problem_Solving_Skill_through_Problem_Based_Learning_PBL_in_Junior_High_School/links/5939f2d0a6fdcc58aea6da21/Improving-Learning-Activity-and-Students-Problem-Solving-Skill-through-Problem-Based-Learning-PBL-in-Junior-High-School.pdf

Short: https://surl.li/ppveu

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