Bootposri, T., and N. Heebkaew Padchasuwan. “Effects of Health Literacy Promotion Program for COVID-19 Surveillance Behavior among Village Health Volunteers in Nongnakhom District Khonkaen Province”. Thai Journal of Health Education, vol. 45, no. 2, Dec. 2022, pp. 88-100, https://he01.tci-thaijo.org/index.php/muhed/article/view/260864.