ล้ำเลิศ ว., and วิจิตรกุลสวัสดิ์ น. “Developing the process of cost management of transportation connector metal sheet roof, cold-rolled steel industry”. Journal of Rattana Bundit University, vol. 12, no. 2, Apr. 2018, pp. 15-23, https://so03.tci-thaijo.org/index.php/rbac/article/view/224812.