Ugulumu, Enock S., and Eno L. Inanga. 2013. “Tanzania’s Small-Scale Sunflower Farmers: Upgrading the Value Chain”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 10 (1):126-45. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/1339.