Sjaiful, Muhammad. “Urgensi Prinsip Proporsionalitas Pada Perjanjian Mudarabah Di Perbankan Syariah Indonesia”. Hasanuddin Law Review 1, no. 2 (August 26, 2015): 228–241. Accessed July 31, 2026. http://103.195.142.46/ojs/index.php/halrev/article/view/81.