Luathep, P., S. Jaensirisak, and S. Saengpradab. “The Impact of Transport Infrastructure Development on Modal Shift: Case Study of Rubber Goods in the Southern Thailand”. Engineering and Applied Science Research, vol. 43, Nov. 2016, pp. 225-7, https://ph01.tci-thaijo.org/index.php/easr/article/view/70195.