PROMNGAM, P. .; SUMRANHUN, P. .; JOTIKASTHIRA, C.; NARUEMON, S.; TEERAKULPISUTH, N.; KONGPHANAT, S. Influencing Service at the Sadao Border Crossing with in Province the Songkhla. Journal of Bansomdej Engineering and Industrial Technology, Bangkok, Thailand, v. 3, n. 2, p. 30–45, 2022. Disponível em: https://ph04.tci-thaijo.org/index.php/JEITB/article/view/4045. Acesso em: 3 apr. 2025.