Suleiman, H. ., and O. . Ishiak. “Analysis of Multi-Objective of Farmers’ Production in Small Scale Maize/Cowpea Farms in Nasarawa State, Nigeria”. Canadian Journal of Agriculture and Crops, vol. 4, no. 2, Sept. 2019, pp. 121-9, doi:10.20448/803.4.2.121.129.