Lubis RH, Manullang AA, Malau CK, Pasaribu MDS, Situmorang S. MEMBANGUN KETERAMPILAN ABAD 21: REVIEW LITERATUR TENTANG EFEKTIVITAS MODEL PEMBELAJARAN PROBLEM-BASED LEARNING (Building 21st Century Skills: A Literature Review on the Effectiveness of Problem-Based Learning Learning Models). Sindoro [Internet]. 2024 Dec. 8 [cited 2025 Aug. 22];9(1):11-20. Available from: https://ejournal.warunayama.org/index.php/sindorocendikiapendidikan/article/view/7637