Andriyan, Dwi Gemina, Chandra Ayu Pramestidewi, and Pra Gemini. “Customer Loyalty Approach to Product Quality, Price and Promotion”. Formosa Journal of Sustainable Research 3, no. 3 (April 6, 2024): 633–646. Accessed April 24, 2026. https://journal.formosapublisher.org/index.php/fjsr/article/view/8686.