Suriani, C., Fadillah, Y. R. dan Kairani, A. (2025) “THE RELATIONSHIP BETWEEN 21ST CENTURY SKILLS AND STUDENT LEARNING OUTCOMES THROUGH THE APPLICATION OF PROBLEM BASED LEARNING MODELS IN CLASS X ENVIRONMENTAL CHANGE MATERIALS AT SMA NEGERI 5 MEDAN T.P 2023/2024”, Jurnal Pelita Pendidikan, 13(1), hlm. 20–28. Tersedia pada: https://jurnal.unimed.ac.id/2012/index.php/pelita/article/view/67193 (Diakses: 3 Juli 2025).