Herlina H. Peningkatan Motivasi Belajar melalui Implementasi Problem Based Learning di Sekolah Dasar. J. Educ. Res. [Internet]. 2024 Jan. 18 [cited 2025 Sep. 13];5(1):142-7. Available from: https://mail.jer.or.id/index.php/jer/article/view/750