Ishola, Abdullahi Saliu, Yusuf Abdul Azeez, and Norfadhilah Mohamad Ali. 2016. “Al‑‘aqd Al‑sahih: The Legal Basis for Determining the Validity of Islamic Financial Transactions”. International Journal of Economics and Financial Issues 6 (3S):140-43. https://econjournals.com/index.php/ijefi/article/view/2622.