Worrakawin , K., Wongmontha, S., Na Thalang, C., & Rattanapongtara, T. (2020). Creativity for Perceptual Tourism in Sandstone Geomophology of Pa-Tam and Sam-Pan-Bok Geologic Park, Ubon Ratchathani Province. Journal of Multidisciplinary in Humanities and Social Sciences, 3(2), 156–169. retrieved from https://so04.tci-thaijo.org/index.php/jmhs1_s/article/view/243532