Vallery, V., Novita, H., & Sary, S. (2020). Effect Of Price, Service Quality And Promotion On Customer Satisfaction (GRAB): Effect Of Price, Service Quality And Promotion On Customer Satisfaction (GRAB). Jurnal Mantik, 3(4), 733-742. Retrieved from https://www.iocscience.org/ejournal/index.php/mantik/article/view/709