Punchalak, J. “The Effectiveness of the Government’s 50:50 Co-payment Scheme in Muang District Lopburi Province”. Journal of Faculty of Humanities and Social Sciences Thepsatri Rajabhat University, vol. 13, no. 3, Dec. 2022, pp. 125-40, https://so01.tci-thaijo.org/index.php/truhusocjo/article/view/257335.