Worrakawin, Kawee, Chawalee Na Thalang, Seri Wongmonta, and Thanarat Ratanapongtra. “Perceptual Tourism in Sandstone Geomorphology of Pa-Tam National Park, Ubon Ratchathani Province”. Rajapark Journal 14, no. 35 (August 20, 2020): 47–60. Accessed May 5, 2024. https://so05.tci-thaijo.org/index.php/RJPJ/article/view/241161.