Ulfah, Maria, ArianaFaula, and Lintang TrenggonowatiDyah. “IMPROVEMENT OF PRODUCT QUALITY THROUGH SIX SIGMA AND FUZZY MARKETING MIX APPROACHES”. Jurnal Teknologi Industri Pertanian 31, no. 1 (July 1, 2021): 1-11. Accessed May 3, 2024. https://jurnal.ipb.ac.id/index.php/jurnaltin/article/view/35863.