Sitindaon, Natanael, Nurul Wardani Lubis, Grace Theresia Malau, Kristina Mesya Yulianti Siburian, and Utrie Sekar Ayuningrum. “Promotion Strategy in Increasing Customer Loyalty in Companies”. Holistic Science 4, no. 3 (October 14, 2024): 362–372. Accessed July 8, 2025. https://jurnal.larisma.or.id/index.php/HS/article/view/728.