Phookanngam, Pennapa. “Risk Analysis and Work Instruction for Accident Reduction in a Steel Structure contractor”. Journal of Vongchavalitkul university 36, no. 1 (June 20, 2023): 19–33. accessed January 8, 2026. https://ph01.tci-thaijo.org/index.php/vujournal/article/view/252517.