Pengaruh Kualitas Pelayanan Dan Kualitas Produk Terhadap Loyalitas Nasabah PT. Bank Sumut Unit Usaha Syariah Kota Medan. jbes [Internet]. 2025 Jun. 30 [cited 2025 Jul. 23];3(1):30-43. Available from: https://ihsan.yrpk.org/index.php/jbes/article/view/29