Safei, Agus Ahmad. “From Oral to Written Da’wah: A Study on the Development of Preaching Methods in Indonesia”. International Journal of Psychosocial Rehabilitation 24, no. 6 (August 31, 2020): 11473–11481. Accessed December 19, 2025. https://www.psychosocial.com/index.php/ijpr/article/view/7988.