S. H. A. shah Gillani, S. M. F. Gardazi, and Atta Ul Mustafa, “E-5: THE CONCEPT OF FREEDOM OF CONTRACT AND THE ROLE OF KHĪYYĀR AL-SHART (OPTION OF STIPULATION) IN ISLAMIC COMMERCIAL LAW”, HIRJ, vol. 6, no. 2, pp. 69-90, Jun. 2022.