यह लेख अभी इस भाषा में उपलब्ध नहीं है।

स्रोत: www.fao.org (Food and Agriculture Organization of the United Nations), www.cgiar.org (Consultative Group on International Agricultural Research), www.irri.org (International Rice Research Institute), www.cimmyt.org (International Maize and Wheat Improvement Center), www.science.org (Science journal — research on Neolithic population genetics)