Nababan, Andrianus, Agnes Novianti Permata Sari, Goklas J. Manalu, Nasib Tua Lumban Gaol, Tasya Ivana Hutagalung, and Ariyanti Waruwu. “The Development of an Instructional Material Book for Increasing the Effectiveness of the Learning Process in the Department of Religious Extension Education”. Jurnal Kependidikan: Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran dan Pembelajaran 9, no. 3 (September 16, 2023): 924–935. Accessed August 16, 2025. https://e-journal3.undikma.ac.id/index.php/jurnalkependidikan/article/view/8789.