Ramanpong, J., N. Tanakanjana Phongkhieo, and D. Emphandhu. “Determination of Recreation Carrying Capacity of Lan Son Camping Area, Phu Soi Dao National Park”. Thai Journal of Forestry, vol. 35, no. 2, Aug. 2016, pp. 78-88, https://li01.tci-thaijo.org/index.php/tjf/article/view/247393.