ISGIYANTI M. UPAYA PENINGKATAN MOTIVASI BELAJAR SISWA MELALUI METODE PROBLEM SOLVING PADA MATA PELAJARAN PPKN DI KELAS XI . learning [Internet]. 2022Feb.21 [cited 2024Nov.20];2(1):9-20. Available from: https://jurnalp4i.com/index.php/learning/article/view/963