ROJIKUN, A. The effect of service quality on Indosat product sales level at the Deliz Cell outlet. Journal of Economics and Business Letters, [S. l.], v. 1, n. 3, p. 27–33, 2021. DOI: 10.55942/jebl.v1i3.123. Disponível em: http://journal.privietlab.org/index.php/JEBL/article/view/123. Acesso em: 4 jul. 2025.