1. Adoption of improved farm technology in Northern Nigeria;Abalu;Quarterly Journal of International Agriculture,1980
2. Exploratory survey of the farming systems of north-eastern Kano State, Nigeria;Abalu,1983
3. An agricultural atlas of Nigeria;Agboola,1979
4. Effects and interactions of a ‘package deal’ for maize;Baker;Experimental Agriculture,1975
5. An economic survey of three villages in Zaria Province;Norman,1972