[1] http://www.worldbank.org/en/topic/foodsecurity
[2] http://www.fao.org/economic/ess/ess-fs/en/
[3] http://ngm.nationalgeographic.com/print/2009/06/cheap-food/bourne-text
[4] David Barkin, "Food Production, Consumption, and Policy," Encyclopedia of Mexico Vol. 1: 494, (Chicago: Fitzroy Dearborn 1997)
[5] William S. Gaud, (8 March 1968), "The Green Revolution: Accomplishments and Apprehensions," AgBioWorld, retrieved 8 August 2011, http://www.agbioworld.org/biotech-info/topics/borlaug/borlaug-green.html
[6] http://timesofindia.indiatimes.com/city/chandigarh/Kalam-exhorted-Punjabis-to-start-2nd-Green-Revolution/articleshow/48259518.cms
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