Boonnak, Nawong, Yongyuth Theapparat, Chonlatid Sontimuang, and Suchada Chantrapromma. 2023. “Determination of Undeclared Synthetic Drugs in Thai Traditional Medicine As Adulterants in Songkhla Province: Dangerous for Human Health”. Journal of Advanced Development in Engineering and Science 6 (17). Babgkok, Thailand:13-22. https://ph03.tci-thaijo.org/index.php/pitjournal/article/view/860.