Worrakawin , K., Wongmontha, S., Na Thalang, C. and 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 (Jun. 2020), 156–169.