Bakoji, Isah. “Economic Analysis of Maize-Cowpea Intercrops in Akko Local Government Area, Gombe State, Nigeria”. Journal of the Bangladesh Association of Young Researchers 2, no. 1 (September 24, 2014): 9-20. Accessed June 19, 2019. https://www.banglajol.info/index.php/JBAYR/article/view/20537.