Worrakawin, K., Na Thalang, C., Wongmonta, S. and Ratanapongtra, T. (2020) “Perceptual Tourism in Sandstone Geomorphology of Pa-tam National Park, Ubon Ratchathani Province”, Rajapark Journal. Bangkok, Thailand, 14(35), pp. 47–60. available at: https://so05.tci-thaijo.org/index.php/RJPJ/article/view/241161 (accessed: 29 September 2026).