PENGGUNAAN METODE SIX SIGMA DALAM MENINGKATKAN KUALITAS PRODUK. VARIABLE RESEARCH JOURNAL, [S. l.], v. 2, n. 01, p. 88–91, 2025. Disponível em: https://variablejournal.my.id/index.php/VRJ/article/view/165.. Acesso em: 27 aug. 2025.