Hartono, Toni, Masduki Masduki, and Pipir Romadi. “The Da’i (Muslim Preachers) and Social Change Challenges: A Study of Da’i Professionalism in Dumai, Riau”. Afkaruna: Indonesian Interdisciplinary Journal of Islamic Studies 16, no. 1 (June 16, 2020): 58–81. Accessed April 30, 2025. https://journal.umy.ac.id/index.php/afkaruna/article/view/7842.