Muhammad Abdo, A., L. Haji Abdullah, and A. K. Ali. “التأصيل الفقهي لبيع المعاطاة: Basis of Islamic Jurisprudent For The Sale of Conduct”. Online Journal of Research in Islamic Studies, vol. 7, no. 2, Nov. 2020, pp. 87-97, https://sare.um.edu.my/index.php/RIS/article/view/27356.