วงค์วิชัยชาญณรงค์. “Characteristics Affecting Public Health Volunteers in Thailand”. Journal of Humanities and Social Sciences University of Phayao 5, no. 1 (June 24, 2019): 123 - 151. Accessed June 1, 2020. https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/197170.