Fatah S, Fitri M, Halim A. The Influence of Product Innovation, Promotions, and Prices on the Decision to Purchase Oppo Brand Smartphones at the Alya Phones Shop, Kotapinang. IIJSE [Internet]. 31Jul.2022 [cited 2Jun.2026];5(2):1063-86. Available from: https://e-journal.uac.ac.id/index.php/iijse/article/view/4173