Sutomo, Felisia. “SIX SIGMA AND QUALITY COST ANALYSIS IN IMPROVING PROFIT”. JOURNAL OF APPLIED MANAGERIAL ACCOUNTING 5, no. 1 (March 28, 2021): 75–80. Accessed September 12, 2026. https://jurnal.polibatam.ac.id/index.php/JAMA/article/view/2739.