Nainggolan, A.R. et al. 2025. Pengaruh Strategi Problem Based Learning Terhadap Hasil Belajar Siswa SMAS Harapan Paya Bakung Kelas X. PESHUM : Jurnal Pendidikan, Sosial dan Humaniora. 4, 4 (May 2025), 5275–5279. DOI:https://doi.org/10.56799/peshum.v4i4.9988.