1. Virtual water: a strategic resource;Allan;Global solutions to regional deficits.’ Groundwater 36(4): 545-546. Bunge. Internal production, consumption and trade estimates, revised,1998
2. Water saving through international trade of agricultural products;Chapagain;Hydrology and Earth System Sciences,2006
3. Deininger, K., Byerlee, D., Lindsay, J., Norton, A., Selod, H. and Stickler, M. (2011) Rising global interest in farmland: can it yield sustainable and equitable benefits? Washington, DC, USA: World Bank. Available at: https://openknowledge.worldbank.org/handle/10986/2263.
4. Food and Agriculture Organization of the United Nations (FAO). (2011) The state of the world's land and water resources (SOLAW), managing systems at risk. Rome, Italy: FAO.
5. Food and Agriculture Organization of the United Nations (FAO). (2000) FAOAQUASTAT database on line on water and agriculture. Available at: http://www.fao.org/ag/agl/aglw/aquastate/dbase/.