Wiyasing, T. . (2024) “Achievement Study of Using the System Flowchart According to the Principles of Contract Amendment”, Journal of Bansomdej Engineering and Industrial Technology. Bangkok, Thailand, 4(2), pp. 27–39. available at: https://ph04.tci-thaijo.org/index.php/JEITB/article/view/3174 (accessed: 5 June 2025).