Lestari, Endang Sri. “Peningkatan Hasil Belajar Siswa Menggunakan Model Pembelajaran Problem Based Learning Pada Materi Sistem Imunitas”. Jurnal Basicedu 6, no. 2 (February 23, 2022): 2687–2693. Accessed May 8, 2026. https://www.jbasic.org/index.php/basicedu/article/view/2470.