1. N. United, Revision of World Population, in, 2011.
2. D. Kilburn, Technology and crop protection key to meeting global food demand, in, 2010.
3. FAO, World food and agriculture in review, in, 2010.
4. W.U.N.W.W.A. Programme), The United Nations World Water Development Report 2015: Water for a Sustainable World, in, UNESCO, Paris, 2015.
5. FAOSTAT, Livestock Primary, in, 2009.