Sansanasupapong, Duangporn, and Ratana Somronthong. 2017. “Perception and Willingness to Obtain Influenza Vaccination Among Healthcare Staff and Elderly Group : A Case Study at the Public Hospital, Nakhonchaisri District, Nakhonpathom Province”. Journal of Health Research 26 (5):235-41. https://he01.tci-thaijo.org/index.php/jhealthres/article/view/85467.