Soukhavong, M., L. Yong, K. Nanthavong, and J. Millet. “Investigation on Species Composition of Plant Community at Tad Xai at Phou Khao Khouay National Park, Lao PDR”. Our Nature, vol. 11, no. 1, June 2013, pp. 1-10, doi:10.3126/on.v11i1.8237.