Factors Influencing Operational Effectiveness in the Zambian Copper Mining Industry. Global Journal of Management and Business Research, [S. l.], v. 19, n. A14, p. 25–31, 2019. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/2949. Acesso em: 5 apr. 2026.