Kieanwatana, Komsit, and Pu Yongjian. 2022. “The Opinions of Foreign Tourist Towards Development for Bangkok to be the Tourism Center of Greater Mekong Sub-Region Railways”. Academic Journal of Thailand National Sports University 6 (3). Chonburi, Thailand:135-44. https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/256401.