Natpratan, Patcharobon, and Sompoth Borwornsin. “The Assessment for Improving Vaccination Program in a Health For All Provinces”. Journal of Health Science of Thailand 3, no. 1 (March 28, 1994): 40–47. Accessed February 1, 2026. https://thaidj.org/index.php/JHS/article/view/6653.