1. de Wit CT (1958) Transpiration and crop yields. Verslag Landbouwkundig Onderzoek, Wageningen, Netherlands: Wageningen University.
2. Marschner H (1995) Mineral Nutrition of Higher Plants. Academic Press, San Diego: 889 p.
3. The impacts of climate change on water resources and agriculture in China;SL Piao;Nature,2010
4. The water footprint of humanity;AY Hoekstra;Proceedings of the National Academy of Sciences of the United States of America,2012
5. IPCC (2007) Climate Change 2007: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Fourth Assessment Report of the International Panel of Climate Change. Cambridge Univ Press, UK.