ไชยา ส. and วงศฺธนวสุ ศ. (2018) “Cautions of Digital Signature Application for a Tuition Fee Receipt, Khon Kaen University”, Local Administration Journal, 11(1), pp. 163–180. available at: https://so04.tci-thaijo.org/index.php/colakkujournals/article/view/116861 (accessed: 13 April 2025).