Pratumtong, Pairatana, Wipaporn Oungkanussorn, and Chalermrat Prasertsang. 2020. “A Study of ASEAN Economic Community Effect on the Nong Khai FDA Checkpoint Operation”. Thai Food and Drug Journal 27 (1). Nonthaburi, Thailand:93-100. https://he01.tci-thaijo.org/index.php/fdajournal/article/view/240489.