Hartono, T., Masduki, M., & Romadi, P. (2020). 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(1), 58–81. https://doi.org/10.18196/AIIJIS.2020.0113.58-81