Hasibuan, I. F., S. Ramadhani, and A. Syakir. “Excellent Service in Attracting and Retaining Customers at PT BPRS Al-Washliyah Medan”. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE), Vol. 8, no. 2, July 2025, pp. 7126-44, doi:10.31538/iijse.v8i2.7054.