Lu Chen และ -. (2020) A Study of the Purchase Cost Control Problem and Optimization Scheme of Saint Roba Company. RANGSIT UNIVERSITY:ม.ป.ท.Lu Chen และ -. 2020. A Study of the Purchase Cost Control Problem and Optimization Scheme of Saint Roba Company. ม.ป.ท.:RANGSIT UNIVERSITY;Lu Chen และ -. A Study of the Purchase Cost Control Problem and Optimization Scheme of Saint Roba Company. ม.ป.ท.:RANGSIT UNIVERSITY, 2020. Print.