Promngam, P. ., Sumranhun, P. ., Jotikasthira, C., Naruemon, S., Teerakulpisuth, N. and Kongphanat, S. (2022) “Influencing Service at the Sadao Border Crossing with in Province the Songkhla”, Journal of Bansomdej Engineering and Industrial Technology. Bangkok, Thailand, 3(2), pp. 30–45. available at: https://ph04.tci-thaijo.org/index.php/JEITB/article/view/4045 (accessed: 3 April 2025).