SARU, P.; PASARIBU, V. A.; RAJAGUKGUK, J. . Analisis Strategi Peningkatan Kepuasan Pelanggan di PT Kereta Api Indonesia Dirve 1 Sumatera Utara. Journal of Laguna Geography, [S. l.], v. 4, n. 1, p. 26-30, 2025. DOI: 10.52562/joulage.v4i1.1538. Disponível em: https://www.journal.moripublishing.com/index.php/joulage/article/view/1538. Acesso em: 17 apr. 2026.