Ari Zaqi Al-Faritsy, and Margaretta Felianti Sitorus. “ANALISIS PENGENDALIAN KUALITAS PRODUKSI DENGAN METODE SIX SIGMA PADA PT SUPRA MATRA ABADI AEK NABARA”. Jurnal Cakrawala Ilmiah 1, no. 6 (February 22, 2022): 1413–1428. Accessed September 13, 2025. https://bajangjournal.com/index.php/JCI/article/view/1507.