SYAH, S.; ANGGERAINI, F.; TAMBA, D. P. The Influence of Employee Productivity and Operational Costs on Increasing Revenue PT. Diamond National Iron Industry Medan. International Journal of Economics (IJEC), [S. l.], v. 3, n. 2, p. 883–897, 2024. DOI: 10.55299/ijec.v3i2.1040. Disponível em: https://ejournal.ipinternasional.com/index.php/ijec/article/view/1040. Acesso em: 1 sep. 2024.