Promngam, P. ., P. . Sumranhun, C. Jotikasthira, S. Naruemon, N. Teerakulpisuth, and S. Kongphanat. “Influencing Service at the Sadao Border Crossing with in Province the Songkhla”. Journal of Bansomdej Engineering and Industrial Technology, vol. 3, no. 2, Dec. 2022, pp. 30-45, https://ph04.tci-thaijo.org/index.php/JEITB/article/view/4045.