1FAO. 1993. Guidelines for land use planning. Development SeriesNo. 1. FAO, Rome.
2UNCED. 1993.Agende 21:Programme of Action for Sustainsble Development. United Nations,New York.
3FAO/UNEP. 1996. Our Land Our Future ANew Approach to LandUse Planning and Management FAO/UNEP, Rome.
4FAO/UNEP. 1997. Negotiating a Sustainable Future for land.Structural and Institutional Guidelines for Land Resources Management in the 21 st Century FAO/UNEP, Rome.
5FAO. 1999. The Future of Our Land, Facing the ChallengeGuidelines for Integrated Planning FAO/UNEP, Rome.
6FAO. 1976. A framework for land evaluation. Soils Bullefin 32.FAO, Rome.
7Gunther Fisher, Harrjj vanVelthuizen, Global Agro-ecological Assessment for Agriculture in the 21 st Century: Methodology and Results, IIASA, FAO.RR-02 -02, March 2002.
8Gunther Fisher, Harrjj vanVelthuizen, Freddy O.Nachtergaele Global Agro-ecologicsl Assessment:Methodology and Results,IIASA,FAO.InterimReport,IR-00-064,November,2000.