Sangyuan, N., R. Tokrisna, D. Thaitakoo, and P. Jongkroy. “Economic Valuation of Cultural Landscape Conservation for Muang Uthai Thani River Edges”. WMS Journal of Management, vol. 6, no. 2, May 2017, pp. 7-16, https://so06.tci-thaijo.org/index.php/wms/article/view/86309.