Chomwarin, Chariya, Wonpen Wirojkud, and Patcharee Horwijit. 2013. “Rainwater Quality With Pathogen and Heavy Metals from Villages in Khon Kaen”. Srinagarind Medical Journal 11 (4):199-210. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13943.