1. Seed multiplication, conditioning and storage;Agrawal,1998
2. FAOSTAT, 2007. Food and Agricultural Organization Statistical database. 3. Goncalves, A.R., 2001. The seed production situation in Angola. Paper Presented at the 2nd Meeting of the SADC CSCU Seed Sub-Committee, 23–24 July, Pretoria, South Africa.
4. Seed marketing in the tropics;Gregg;Seed Science and Technology,1983
5. Maize breeding research in eastern and southern Africa: Current status and impacts of past investments by the public and private sectors, 1966–1997;Hassan,2001