Jeffrey, Jeffrey, Rosinta Romauli Situmeang, and Christopher Christopher. “The Effect of Product Quality, Responsiveness and Promotion on Customer Satisfaction at Pt Global Graha Sarana Abadi”. Jurnal Mantik 5, no. 3 (November 29, 2021): 2005-2012. Accessed April 28, 2026. https://iocscience.org/ejournal/index.php/mantik/article/view/1825.