PENERAPAN METODE SIX SIGMA DAN PERBAIKAN KERJA PADA PENGENDALIAN KUALITAS SEPATU CV. CIR. STT [Internet]. 2018 Oct. 30 [cited 2026 May 25];9(1):49-57. Available from: https://ijc.ilearning.co/index.php/sttyuppentek/article/view/585