Khrueakham, Anurak, Sarinthip Pongkureekan, Sontaya Phallapang, Intira Wannatip, and Phattrapon Ponngern. 2009. “Consumers’ Satisfaction of Nontree E-sarn Drinking Water Produced by Kasetsart University, Chalermphrakiat Sakonnakhon Province Campus”. Kasetsart Journal of Social Sciences 30 (1):48-59. https://so04.tci-thaijo.org/index.php/kjss/article/view/246487.