Nak-ai, W., C. Klai-nak, and A. Wijitr. “A preventive communicable disease model: a case study for remote tribal communities in Thailand”. Journal of Public Health and Development, vol. 19, no. 3, Sept. 2021, pp. 191-03, https://he01.tci-thaijo.org/index.php/AIHD-MU/article/view/251882.