1. Yields and qualities of pigeonpea varieties grown under smallholder farmers' conditions in Eastern and Southern Africa;Høgh-Jensen;Afr. J. Agric. Res.,2007
2. A Framework for Conceptualizing Impact Assessment and Promoting Impact Culture in Agricultural Research;Alene,2006
3. Statistical Data Base;Food and Agricultural Organisation, (FAO),2014
4. Statistic of Maize Production Country by Country;United States Department of Agriculture (USDA),2014