Wattatham, Sadanon, and Chaturaphat Chantith. “Evaluation of the Effectiveness and Cost-Efficiency of Nudging Overdue Car Taxpayers Behavior through Reminder Letters”. Journal of Applied Economics and Management Strategy, vol. 11, no. 2, Dec. 2024, pp. 124-42, https://kuojs.lib.ku.ac.th/index.php/jems/article/view/5887.