Vera Hidayati. “Peningkatan Hasil Belajar Materi Sistem Hukum Di Indonesia Melalui Model Pembelajaran Problem Based Learning Siswa Kelas XI IBB 1 SMA IT”. Al-Amin Journal: Educational and Social Studies, Vol. 6, no. 01, June 2023, pp. 160-76, https://ejournal.kopertais4.or.id/sasambo/index.php/alamin/article/view/5367.