JEFFREY, J.; SITUMEANG , R. R. .; CHRISTOPHER, C. The Effect Of Product Quality, Responsiveness and Promotion on Customer Satisfaction at PT. Global Graha Sarana Abadi. Jurnal Mantik, [S. l.], v. 5, n. 2, p. 1313-1320, 2021. Disponível em: https://www.ejournal.iocscience.org/index.php/mantik/article/view/1532. Acesso em: 13 jun. 2026.