Khunlang, T., W. Thongkamkaew, and C. Kesarat. “The Influence of Implementing Vaccination Policy Under the COVID-19 Pandemic affecting the Efficiency Performance of Public Health Volunteers in Songkhla Municipality”. Journal of Modern Learning Development, vol. 9, no. 1, Jan. 2024, pp. 190-02, https://so06.tci-thaijo.org/index.php/jomld/article/view/264415.