Waelveerakup, W., M. Jumnain, and P. Suksapornlerte. “Factors Related to Initiation of Cigarette Smoking Behavior Among Secondary School Student in Nakhon Pathom Province”. Interdisciplinary Research Review, vol. 13, no. 3, Oct. 2018, pp. 16-21, https://ph02.tci-thaijo.org/index.php/jtir/article/view/122438.