Yulianto, A. T., and H. C. Wahyuni. “Minimize Customer Return by Using the Method of Quality Control Circle and Quality Loss Fuction: Study from PT Artha Food”. PROZIMA (Productivity, Optimization and Manufacturing System Engineering), Vol. 3, no. 1, Mar. 2021, pp. 43-56, doi:10.21070/prozima.v3i1.1301.