1. Bennett, A., G. Bending, D. Chandler, S. Hilton, and P. Mills. 2012. Meeting the demand for crop production: The challenge of yield declines in crops grown in short rotations. Biological Reviews 87: 52–71.
2. Brown, L.R. 2012. Full planet, empty plates: The new geopolitics the food scarcity, 79. Washington: Earth Policy Institute www.earth-policy.org .
3. Charles, H., J. Godfray, J.R. Beddington, R. Crute, L. Haddad, D. Lawrence, J.F. Muir, J. Pretty, S. Robinson, S.M. Thomas, and C. Toulmin. 2018. Food security: The challenge of feeding 9 billion people. Food Security https://waterlandandecosystems.wikispaces.com/file/view/Component2_CIAT.pdf .
4. Coleman-Jensen, Alisha, Mark Nord, Margaret S. Andrews, and Steven Carlson. 2011. Household food security in the United States in 2010, Economic Research Report 118021. United States Department of Agriculture, Economic Research Service. https://ideas.repec.org/p/ags/uersrr/118021.html .
5. FAO. 1999. Food insecurity: When people must live with hunger and fear of starvation. The State of Food Insecurity in the World Report, Rome, 76.