MULYANDI, R.; SIREGAR, B. W. S.; ELIZABETH, E.; RIDNAWATI, R.; RISKI, D. M. The role of internal marketing in improving service quality: A study of service companies. Journal of Economics and Business Letters, [S. l.], v. 6, n. 3, p. 75–85, 2026. DOI: 10.55942/jebl.v6i3.1869. Disponível em: https://journal.privietlab.org/index.php/JEBL/article/view/1869. Acesso em: 3 jun. 2026.