NIKMAH, W.; ARMANIAH, H. The effect of service quality and satisfaction on customer loyalty at Kumon East Jakarta. Journal of Economics and Business Letters, [S. l.], v. 1, n. 3, p. 44–50, 2021. DOI: 10.55942/jebl.v1i3.124. Disponível em: https://www.journal.privietlab.org/index.php/JEBL/article/view/124. Acesso em: 27 jul. 2025.