Srisasalak, Ponpat, Nattapassorn Tanabawornpanich, and Anan Thamchalai. 2023. “GUIDELINES FOR IMPROVING OPERATIONAL COMPETENCE OF THE IMMIGRATION OFFICER”. Journal of MCU Phetchaburi Review 5 (2):หน้า 133 - 151. https://so03.tci-thaijo.org/index.php/JPR/article/view/264123.