1. White F. The vegetation of Africa, a descriptive memoir to accompany the UNESCO/AETFAT/UNSO vegetation map of Africa (3 Plates, Northwestern Africa, Northeastern Africa, and Southern Africa, 1: 5,000,000). Unesco, Paris; 1983.
2. Prepared by the UNEP World Conservation Monitoring Centre;Jenkins MD Groombridge,2002
3. Biodiversity: Turning up the heat on hotspots;HP Possingham;Nature,2005
4. P Lafrance JM Dubois Apports Télédétection À Lutte Contre Sécher Collect Univ Francoph Ed AUPELF-UREF;F Achard,1990
5. Terrestrial Ecoregions of the World: A New Map of Life on Earth: A new global map of terrestrial ecoregions provides an innovative tool for conserving biodiversity;DM Olson;BioScience,2001