Osman, K., B. Mohd Nasir, S. R. Tibek, and A. I. Mokhtar. “USLUB DA’WAH IN DĪWĀN IMAM SHĀFIᶜĪ”. Al-Hikmah, Vol. 7, no. 2, Dec. 2015, pp. 23-39, doi:10.17576/alhikmah.2015.72/149.