Mahyuni Miraza, Harmen Nasution, Iskandarini. INTERNAL AND EXTERNAL FACTORS AFFECTING CUSTOMER LOYALTY OF BANK SUMUT. IJEBAS [Internet]. 2024 Feb. 19 [cited 2025 Nov. 29];4(1):237-45. Available from: https://radjapublika.com/index.php/IJEBAS/article/view/1426