Rusfian EZ, Evalina E, Ahmaddien I. Effects of Price, Promotion, and Product Quality on Customer Satisfaction of Oppo Smartphone. Mantik [Internet]. 2022Feb.22 [cited 2026Aug.25];5(4):2601-6. Available from: https://www.ejournal.iocscience.org/index.php/mantik/article/view/2046