RIANI ALTINIA, S.; ADHI UTAMA, A. . Servqual-Based Service Quality Optimization to Drive Profit Growth at ITTR English Course. Eduvest - Journal of Universal Studies, [S. l.], v. 6, n. 6, p. 7323–7339, 2026. DOI: 10.59188/eduvest.v6i6.53298. Disponível em: https://eduvest.greenvest.co.id/index.php/edv/article/view/53298. Acesso em: 27 jun. 2026.