Supandi, Supandi. “MODEL PEMBELAJARAN PROBLEM BASED LEARNING MOTIVASI BELAJAR DAN PENINGKATAN PRESTASI BELAJAR MATA PELAJARAN EKONOMI SMA”. Jurnal Penelitian dan Pendidikan IPS 10, no. 3 (April 24, 2017): 379–388. Accessed May 2, 2024. https://ejournal.unikama.ac.id/index.php/JPPI/article/view/1689.