บุตรงาม ส. “Study of Load Carrying Capacity of Steel Bridges Using Bolts and Welding for Connections”. NKRAFA JOURNAL OF SCIENCE AND TECHNOLOGY, vol. 14, Dec. 2018, pp. 105-9, https://ph02.tci-thaijo.org/index.php/nkrafa-sct/article/view/159337.