Anurattananon, C., P. Klomjit, S. Saelem, K. Kujirapan, T. Charoennoppakit, and P. Yahatta. “Reducing The Time of Picking up Orders A Case Study of Construction Materials Warehouse”. Thai Industrial Engineering Network Journal, vol. 5, no. 2, Dec. 2019, pp. 36-45, https://ph02.tci-thaijo.org/index.php/ienj/article/view/192068.