NUGRAHA, S.; SUPRAOTO, Y.; MASDITOU. Analysis of Service Effectiveness on Customer Satisfaction in the Food & Beverage Bussiness in Tarutung, North Tapanuli - North Sumatra . International Journal of Economics and Management, Medan, Sumatera Utara, Indonesia, v. 2, n. 02, p. 151–160, 2024. DOI: 10.54209/iem.v2i02.42. Disponível em: https://iem.cdfpublisher.org/index.php/iem/article/view/42. Acesso em: 27 apr. 2026.