Fitrianingsih, Lukieto Cahyadi, and Limega Candrasa. 2026. “Relational Marketing Management and Influence on Customer Loyalty: Empirical Evidence from Islamic Banks in North Sumatra”. Jurnal Ilmiah Manajemen Kesatuan 14 (1):855-64. https://doi.org/10.37641/jimkes.v14i1.4673.