Zakaria, Mohamad Zaharuddin, and Akhtarzaite Abdul Aziz. 2013. “Purchase Undertaking in Equity-Based Sukuk: Does It Amount to Guarantee”. The Journal of Muamalat and Islamic Finance Research 10 (1):43-68. https://jmifr.usim.edu.my/index.php/jmifr/article/view/153.