Suengthavorn, Thongchai, and Pornpan Kerdnaimongkol. 2018. “Effects of Good Manufacturing Practice (GMP) on Sealed Drinking Water Factories in Rayong Province”. Journal of Health Science of Thailand 17 (Supplement VII):SVII2141-2150. https://www.thaidj.org/index.php/JHS/article/view/5397.