Pratumtong, P. ., W. . Oungkanussorn, and C. Prasertsang. “A Study of ASEAN Economic Community Effect on the Nong Khai FDA Checkpoint Operation”. Thai Food and Drug Journal, vol. 27, no. 1, Mar. 2020, pp. 93-100, https://he01.tci-thaijo.org/index.php/fdajournal/article/view/240489.