Hafifuddin, Hafifuddin, and Ratna Tri Hari S. “Pengaruh Biaya Promosi Dan Margin Terhadap Jumlah Nasabah Bank Umum Syariah Periode 2015 - 2018”. Indonesian Journal of Economic and Business 1, no. 1 (June 30, 2023): 11–24. Accessed June 26, 2026. https://jurnal.pdpi.or.id/index.php/ijeb/article/view/4.