Sonsab, Thipkamol, Wanchai Arunpraparut, and Nantachai Pongpatttananurak. “Determination of Forest Encroachment Risk in Head Watershed at Doi Phu Kha National Park, Nan Province”. Thai Journal of Forestry 37, no. 2 (December 26, 2018): 60–70. Accessed May 21, 2024. https://li01.tci-thaijo.org/index.php/tjf/article/view/246645.