Al-Idah, J. E., Dr. Lutfullah Saqib, and Dr. Kellie W. Roberts. “Istisnā’- A Realistic Approach to the Concept in Islamic Finance and Its Application to the Agricultural Sector in Pakistan”. Al-Idah , Vol. 34, no. - 1, July 2017, pp. 18 -39, http://al-idah.pk/index.php/al-idah/article/view/80.