Wijaya, Oscarius Yudhi Ari. “Influence of Product Quality, Promotion and Design on Purchase Decision of Scooter Matic Vario”. International Journal of Economics Development Research (IJEDR) 4, no. 1 (May 30, 2023): 437–445. Accessed July 22, 2025. https://journal.yrpipku.com/index.php/ijedr/article/view/2948.