“QUALITY CONTROL OF SANDAL OUTSOLE USING SIX SIGMA METHOD AND FAILURE MODE AND EFFECT ANALYSIS (FMEA)”. International Journal of Economic Integration and Regional Competitiveness 2, no. 8 (August 31, 2025): 56–69. Accessed November 26, 2025. https://e-journal.antispublisher.id/index.php/IJEIRC/article/view/392.