Junwi, B., A. Witwattananggoon, J. Kaewkiaw, and N. Jantawee. “The different between ages and self-protection behavior of covid-19, Nakhon Si Thammarat Province”. UBRU Journal for Public Health Research, vol. 11, no. 2, Dec. 2022, pp. 90-100, https://he02.tci-thaijo.org/index.php/ubruphjou/article/view/255429.