บุญยะศิรินันท์ ล. (2018). Variables Reduction for Creativity Tourism Approaches in Sustainable Ecotourism Business Development: A Case Study of Tourists in Thailand National Parks. CRMA Journal of Humanities and Social Sciences, 5, 243–258. retrieved from https://so01.tci-thaijo.org/index.php/CRMA_HUSO/article/view/154548