Sriwongwanna J. Guideline for Development to raise the Standards of Sustainable Nature-based Tourism in Ubon Ratchathani. JRDI. RMU [Internet]. 2020 Dec. 15 [cited 2024 May 8];7(2):455-72. Available from: https://so03.tci-thaijo.org/index.php/rdirmu/article/view/226921