Puchongkawarin, Channarong, and Kasin Ransikarbum. “Analysis of Criteria and Public Transportation Routing in Ubonratchathani Province”. Naresuan University Engineering Journal 15, no. 1 (June 13, 2020): 6–16. Accessed April 30, 2024. https://ph01.tci-thaijo.org/index.php/nuej/article/view/187180.