ธีรศาศวัต สุวิทย์. “The Occupation of Raising Toxin-Free Vagetables and Isan Fresh-Food Market”. RMUTI Journal Humanities and Social Sciences 6, no. 2 (November 22, 2019): 118–125. Accessed March 29, 2024. https://so05.tci-thaijo.org/index.php/RMUTI_SS/article/view/201856.