M. Husnan , Lubis, and Mawar Kembaren Mardiah. “The Role of Pesantren in Preserving and Disseminating Islamic Knowledge through Writing: A Study of North Sumatra Ulama”. Top Linguistic and Language Journal (TLLJ), vol. 1, no. 1, Feb. 2023, pp. 26-35, https://zapjournals.com/Journals/index.php/tllj/article/view/170.