1. Z. Bharucha, J. Pretty, The roles and values of wild foods in agricultural systems. Phil. Trans. R. Soc. B 365(1554), 2913–2926 (2010). https://doi.org/10.1098/rstb.2010.0123
2. FAO, IFAD, UNICEF, WFP, WHO, The state of food security and nutrition in the world 2017. Building resilience for peace and food security (FAO, Rome, 2017)
3. FAO, IFAD, WFP, The state of food insecurity in the world 2015. Meeting the 2015 international hunger targets: taking stock of uneven progress (FAO, Rome, 2015)
4. HarvestChoice, Agro-ecological Zones of sub-Saharan Africa (International Food Policy Research Institute and University of Minnesota, Washington, DC, St. Paul, MN, 2010)
5. FAO, Agro-ecological zoning. Guidelines. FAO Soils Bulletin 73 (FAO, Rome, 1996)