Hasibuan, Ilaika Fauziah, Sri Ramadhani, and Ahmad Syakir. “Excellent Service in Attracting and Retaining Customers at PT BPRS Al-Washliyah Medan”. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE) 8, no. 2 (July 4, 2025): 7126-7144. Accessed April 21, 2026. https://e-journal.uac.ac.id/index.php/iijse/article/view/7054.