Jayanti, A., T. Tasrim, and Nina Fapari Arif. “Determining Customer Satisfaction on Telkomsel Card User in Belopa City, Luwu Regency”. Jurnal Mantik, vol. 5, no. 1, May 2021, pp. 223-9, doi:10.35335/mantik.Vol5.2021.1177.pp223-229.