Heri Effendi, Siti Aisyah, Muspardi, and Muslim. 2021. “Validity of Historical Learning Based on Islamic History (Psi-Bk) As a Radicalism Date for Radicalism in High Education”. ICHELSS: International Conference on Humanities, Education, Law, and Social Sciences 1 (1):591-600. https://journal.unj.ac.id/unj/index.php/hispisi/article/view/22324.