บุตรงาม สมพงษ์. “Study of Load Carrying Capacity of Steel Bridges using Bolts and Welding for Connections”. NKRAFA JOURNAL OF SCIENCE AND TECHNOLOGY 14, no. 1 (December 4, 2018): 105–109. accessed August 31, 2026. https://ph02.tci-thaijo.org/index.php/nkrafa-sct/article/view/159337.