Pukngam, Somnimirt, Prasong Saguantam, and Supaporn Phongsala. 2017. “Risk Encroachment Area Analysis in the Right Side of Mae Ngao National Reserved Forest, Lampang Province”. Thai Journal of Forestry 36 (1). Bangkok, Thailand:123-28. https://li01.tci-thaijo.org/index.php/tjf/article/view/246915.