SINAGA, Heru Ambrose; SUSENO, Suseno. Upaya Meningkatkan Kualitas Produk Manhole Menggunakan Metode Six Sigma Di PT XYZ . ULIL ALBAB : Jurnal Ilmiah Multidisiplin, [S. l.], v. 2, n. 9, p. 4270–4282, 2023. DOI: 10.56799/jim.v2i9.2125. Disponível em: https://al-haramjournal.co.id/JIM/article/view/2125. Acesso em: 6 aug. 2026.