1. Biodiversity for Food and Agriculture: Contributing to food security and Sustainability in a Changing World,2010
2. http://www.fao.org/docrep/014/i2215e/i2215e.pdf
3. Report on the State of the World's Plant Genetic Resources for Food and Agriculture,2010
4. How Many Plants Feed the World?
5. The Cultivated Plants of the Tropics;Rehm,1991