PENERAPAN METODE SIX SIGMA DAN PERBAIKAN KERJA PADA PENGENDALIAN KUALITAS SEPATU CV. CIR. Jurnal STT Yuppentek, [S. l.], v. 9, n. 1, p. 49–57, 2018. Disponível em: https://ijc.ilearning.co/index.php/sttyuppentek/article/view/585. Acesso em: 25 mei. 2026.