Poum, Amornsak, and Pachara Matian. “Factors Effecting to Policy Implementation to Accessibility COVID-19 Vaccine in Phetchabun Province, Thailand”. Journal of Health Science and Alternative Medicine 5, no. 01 (April 30, 2023): 23–27. accessed October 3, 2026. https://he01.tci-thaijo.org/index.php/jhealthscialternmed/article/view/260526.