Jantakham, Supamitr, Danwichai Sairaksa, and Rungsan Singhalert. 2020. “The Geotourism Development Strategies for Khon Kean Geopark Towards to UNESCO Global Geopark”. Journal of Education Rajabhat Maha Sarakham University 17 (1). Bangkok, Thailand:599-611. https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/252243.