Piyawoot Pongphet และผู้แต่งคนอื่นๆ. (2010) The Study on the Crush Characteristic of Polyurethane Foam-filled Rectangular Steel Tubes Under Compressive Load. <i>KKU Engineering Journal</i>, <i>37</i>(2), 101-108.Piyawoot Pongphet และผู้แต่งคนอื่นๆ. "The Study on the Crush Characteristic of Polyurethane Foam-filled Rectangular Steel Tubes Under Compressive Load". KKU Engineering Journal 37 (2010):101-108.Piyawoot Pongphet และผู้แต่งคนอื่นๆ. The Study on the Crush Characteristic of Polyurethane Foam-filled Rectangular Steel Tubes Under Compressive Load. Faculty of Engineering, Khon Kaen Univeristy:ม.ป.ท. 2010.