Narendra Sukma, Fitra Bhagavadgita Sandy Asmara, Yudho Purnomo, and Mohammad Sodikin. “Enhancing Customer Loyalty Through Service Quality: A Congruity Value Theory Perspective in Indonesian Postal Services”. IJUS | International Journal of Umranic Studies 7, no. 2 (July 31, 2024): 7–14. Accessed February 23, 2025. https://unissa.edu.bn/journal/index.php/ijus/article/view/934.