1. Anderson, J.A.R., 1961. The ecology and forest types of the peat swamp forests of Sarawak and Brunei in relation to the ir silviculture. Ph.D. the sis, Univ. of Edinburgh, Edinburgh.
2. Anon., 1940. Sal regeneration de novo. Indian For., 66: 525–529.
3. Appanah, S., 1979. The ecology of insect pollination of some tropical rainforest trees. Ph.D. the sis, Univ. of Malaya.
4. Pollination in Malaysian primary forests;Appanah;Malays. For.,1981
5. Pollination of androdioecious Xerospermum intermedium Radlk. (Sapindaceae) in a rain forest;Appanah;Bot. J. Linn. So.,1982