1. Ampornpan, L.A., Dhillion, S.S. (Eds.), 2003. The Environment of Na Haeo, Thailand: Biodiversity, Non-Timber Products, Land Use and Conservation. Craftman Press, Bangkok, (in press).
2. Arnold, J.E.M., 1991. Tree Products in Agroecosystems: Economic and Policy Issues, Gatekeeper Series No. 28. International Institute for Environment and Development, London.
3. Baumer, M., 1995. Arbres, arbustes et arbrisseaux nourriciers en Afrique occidentale. Enda Editions, Dakar, Senegal.
4. The contribution of wild plants to human nutrition in the Ferlo (northern Senegal);Becker;Agrofor. Syst.,1983
5. Benneh, G., 1987. Land tenure and agroforestry land use systems in Ghana. In: Raintree, J.B. (Ed.), Proceedings of the International Workshop on Tenure Issues in Agroforestry, Land, Trees and Tenure, Nairobi, 27–31 May 1985. The Land Tenure Center, University of Wisconsin, Madison, USA, pp. 163–168.