Khrueakham, A., S. Pongkureekan, S. Phallapang, I. Wannatip, and P. Ponngern. “Consumers’ Satisfaction of Nontree E-sarn Drinking Water Produced by Kasetsart University, Chalermphrakiat Sakonnakhon Province Campus”. Kasetsart Journal of Social Sciences, vol. 30, no. 1, Apr. 2009, pp. 48-59, https://so04.tci-thaijo.org/index.php/kjss/article/view/246487.