มูลทิ จิตรา. 2021. “Factors Influencing Preventive Behavior of Coronavirus Disease 2019 Among Village Health Volunteers in Kong Krailat District, Sukhothai Province”. Journal of the Office of Disease Prevention and Control 9 Nakhon Ratchasima 27 (2):5-14. https://he02.tci-thaijo.org/index.php/ODPC9/article/view/249484.