Fithri, Prima, and Niffy Eri Yeni. “Analisis Pengendalian Kualitas Pada Engine Boss Drive Face K44F Dengan Metode Six Sigma Di PT. Sparta Guna Sentosa”. Jurnal Optimasi Sistem Industri 15, no. 2 (November 14, 2016): 105–113. Accessed April 2, 2025. https://josi.ft.unand.ac.id/index.php/josi/article/view/227.