Rojanaworarit, Dr.Chanapong. “Epidemiology as Framework for Conducting Health Research: A Theoretical Overview”. Journal of Food Health and Bioenvironmental Science 8, no. 1 (January 1, 2015): 119–133. accessed September 22, 2026. https://li01.tci-thaijo.org/index.php/sdust/article/view/178936.