Janpol K, Manmee C, Krairitthichai U. 2017. “Epidemiology of Influenza A (H1N1) 2009: Rajavithi Hospital”. Journal of The Department of Medical Services 42 (3):96-105. https://he02.tci-thaijo.org/index.php/JDMS/article/view/248875.