Iwan Gunawan , Nazief Nirwanto , Achmad Firdiansjah (2020) “Customer Loyalty: Relationship Marketing, Product Quality, and Brand Image ”, International Journal of Advanced Science and Technology, 29(05), pp. 11107-11117. Available at: http://sersc.org/journals/index.php/IJAST/article/view/25194 (Accessed: 28July2026).