Sukoco, Daud, Zulfatus Sa’diah, and Aqif Khilmia. 2022. “Implementation Of Khiyar On Ba’i Salam Transactions In Student Cooperative At Islamic Boarding School Darussalam Gontor For Girl 2 According To Fiqh Muamalah”. Al-Muamalat Jurnal Hukum Dan Ekonomi Syariah 7 (1), 1-12. http://journal.iainlangsa.ac.id/index.php/muamalat/article/view/4039.