“PENGENDALIAN KUALITAS PRODUKSI LAKOP SAPU LANTAI DENGAN MENGGUNAKAN METODE SIX SIGMA DI UD. XY PURWOSARI”. JKIE (Journal Knowledge Industrial Engineering), vol. 5, no. 1, Apr. 2018, pp. 13-24, https://doi.org/10.35891/jkie.v5i1.1910.