1. Achard, F., Eva, H.D., Stibig, H.J, Mayaux, P., Gallego, J., Richard, T., & Malingreau, J.P. (2002). Determination of deforestationrates of the world's humid tropical forests. Science, 297: 999-1002.
2. Aiken, S. & Leigh, C. (1992). Vanishing Rain Forests: The Ecological Transition in Malaysia. New York: Oxford Uni. Press.
3. Appanah, S. & Abdul Razak, M.A. (1998). Planting high quality indegenous species in Sarawak. Planted Forest in Sarawak - An International Conference 1998. Forest Dept. Sarawak.
4. Ashton, P. (1982). Dipterocarpaceae. Flora Malesiana Series, 1(9): 237-552.
5. Ashton, P. (1995). Biogeography and Ecology. In Soepadmo, E. & Wong, K.M. (Eds.), Tree flora of Sabah and Sarawak. Forest Research Institute Malaysia, Sabah Forestry Dept. & Sarawak Forestry Dept.