Chandrasekharan, C. 1995. Terminology, definition and classification of forest products other than wood. In Report of the International Expert Consultation on Non-Wood Forest Products. Yogyakarta, Indonesia 17–25 January 1995. FAO NWFP Series No.3, pp. 345–380. Rome, Food and Agriculture Organization of the United Nations.
Cook, F.E.M. 1995. Economic botany data collection standard. Royal Botanic Gardens Kew, Kent, UK.
FAO. 1992. NWFP database, by A. Singh. Working Paper. Rome, Food and Agriculture Organization of the United Nations.
FAO. 2001. Forest Resources Assessment (FRA) 2000. Internet document. http://www.fao.org/forestry/fo/fra/main/index.jsp
Homa, K.O. 1994. Plant extractivism in the Amazon: limitations and possibilities. In Cluesner-Godt & I.Sachs. Extractivism in the Brasilian Amazon: perspectives on regional development. MAB Digest 18. Paris, UNESCO. 89pp.
Shiva, M.P. & Mathur, R.B. 1996. Standard NTFP classification & documentation manual. Dehra Dun, India. Centre of Minor Forest Products.
