Junwi, Boonprajuk, Anchana Witwattananggoon, Jeerapa Kaewkiaw, and Nisakorn Jantawee. 2022. “The different between ages and self-protection behavior of covid-19, Nakhon Si Thammarat Province”. UBRU Journal for Public Health Research 11 (2):90-100. https://he02.tci-thaijo.org/index.php/ubruphjou/article/view/255429.