FITHRI, P.; YENI, N. E. Analisis Pengendalian Kualitas pada Engine Boss Drive Face K44F dengan Metode Six Sigma di PT. Sparta Guna Sentosa. Jurnal Optimasi Sistem Industri, Padang, ID, v. 15, n. 2, p. 114–127, 2016. DOI: 10.25077/josi.v15.n2.p114-127.2016. Disponível em: https://josi.ft.unand.ac.id/index.php/josi/article/view/80. Acesso em: 2 may. 2024.