Dwi Hidayatul Firdaus. “ANALISIS KEBIJAKAN EKONOMI UMAR BIN KHATTAB PERSPEKTIF BISNIS SYARIAH”. At-Tahdzib: Jurnal Studi Islam dan Muamalah 1, no. 2 (December 12, 2015): 262–278. Accessed July 7, 2026. https://ejournal.staiat-tahdzib.ac.id/index.php/tahdzib/article/view/20.