Penpong, M. S. (2020). An Economics Valuation of Recreational Benefits of Coral Reef at Mu Kho Ang Thong National Park, Surat Thani Province. Journal of Management Sciences Suratthani Rajabhat University, 7(1), 175–201. retrieved from https://so03.tci-thaijo.org/index.php/msj/article/view/133084