SIHOTANG, Y. B.; FITRIA, L. Usulan Perbaikan Pengendalian Kualitas Menggunakan Metode Six Sigma di PT. Progressio Indonesia. e-Proceeding FTI, [S. l.], v. 1, n. 2, 2023. Disponível em: https://eproceeding.itenas.ac.id/index.php/fti/article/view/1702. Acesso em: 1 feb. 2026.