1. The Use of Aircraft in Agriculture;Akesson,1976
2. Northumberland grower breaks world wheat yield record;Anon.;Farmers Weekly,2015
3. The Bread of Our Forefathers: An Enquiry in Economic History;Ashley,1928
4. Development, structure and mechanical properties of the wheat grain;Bechtel,2009
5. The Encyclopedia of Seeds, Science, Technology and Uses,2006