P. Srichanthawong, A. Hamanee, and P. Mahapornphom, “The Development of Cultural Ecotourism Efficiency of Phu Tao Pong, Ban Bung Kum, Na Ho Sub-District, Dansai District, Loei Province”, LRUJ, vol. 15, no. 51, pp. 33–43, Apr. 2020.