ABDUL JALAL, Afizah. Enhancing Operational Efficiency in XYZ Coop: A Six Sigma Approach. JBS Nexus, [S. l.], v. 2, n. 2, p. 52–57, 2025. Disponível em: https://journal.uthm.edu.my/index.php/jbsnexus/article/view/22699. Acesso em: 12 aug. 2026.