Osman, K., B. Mohd Nasir, S. R. Tibek, and A. I. Mokhtar. “USLŪB DAKWAH DALAM DĪWĀN IMAM SHĀFIᶜĪ”. Al-Hikmah, Vol. 7, no. 2, Dec. 2015, pp. 23-39, https://spaj.ukm.my/jalhikmah/index.php/jalhikmah/article/view/149.