Hartono, T., Masduki, M. and 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 (Jun. 2020), 58–81. DOI:https://doi.org/10.18196/AIIJIS.2020.0113.58-81.