Chantraket, R., P. Uttaruk, U. Klinhom, D. L. Skole, J. H. Samek, and O. Castaneda. “Internet-Based Development of Medicinal Plants Geospatial System in Phu Phan Forest Complex: Northeastern Thailand”. Agriculture and Natural Resources, vol. 48, no. 2, Apr. 2014, pp. 227-40, https://li01.tci-thaijo.org/index.php/anres/article/view/243251.