พรพิเนตพงศ์ กัลยาณี. “Economic Valuation of Recreational Site: Single Site Model Case”. Journal of Public Administration, Public Affairs, and Management 3, no. 2 (August 1, 2005): 13. accessed September 28, 2026. https://so05.tci-thaijo.org/index.php/pajournal/article/view/23205.