Kuwivattanachai, Pornchai, and Suratda Moto. “A Comparison of Vernonia Cinerea and Placebo for Smoking Cessation”. Srinagarind Medical Journal 32, no. 6 (December 20, 2017): 542–546. Accessed April 28, 2024. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/106183.