Emphandhu, D., and U. Polpiwat. “Strategic Policy Options for Enhancement of National Park and Local Community Linkage in Tourism Management of Thai National Parks”. Kasetsart Journal of Social Sciences, vol. 27, no. 2, Dec. 2006, pp. 347-62, https://so04.tci-thaijo.org/index.php/kjss/article/view/246417.