Ussanawarong, Skunrat, and Kannikar Chirasirisap. 2013. “Study of Enzyme Cholinesterase Levels of Farmers in Kud – Kwang Village”. Srinagarind Medical Journal 8 (4):215-19. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13662.