Khowsroy, K., and V. Khowsoi. “Prediction Equation for Estimating COVID-19 Vaccination Intentions Among Older Adults: A Case Study of Chanthaburi Province”. Rajamangala University of Technology Tawan-Ok Research Journal, vol. 16, no. 2, Dec. 2023, pp. 14-23, https://li01.tci-thaijo.org/index.php/researchjournal2rmutto/article/view/259419.