Pokpermdee, Pongsadhorn, and Nusaraporn Kessomboon. 2018. “60th Anniversary of the World Health Organization - 6 ทศวรรษองค์การอนามัยโลก”. Journal of Health Science of Thailand 18 (1):139-48. https://thaidj.org/index.php/JHS/article/view/1638.