นิลสาคู ว. and วงศฺธนวสุ ศ. (2017) “Knowledge Understanding and practice related to traffic sign of high school students in Khon Kaen municipality, khon Kaen Province”, Local Administration Journal, 10(4), pp. 139–163. Available at: https://so04.tci-thaijo.org/index.php/colakkujournals/article/view/116899 (Accessed: 15 May 2024).