ปุณธนกรภัทร์ ณ. . and ปุณธนกรภัทร์ น. . (2021) “Work study to improving efficiency the printing process on refrigerator air vent”, Journal of Bansomdej Engineering and Industrial Technology. Bangkok, Thailand, 2(1), pp. 43–53. available at: https://ph04.tci-thaijo.org/index.php/JEITB/article/view/4774 (accessed: 19 April 2025).