Oluwole, M. S., Masugari, D. Y., and Ojekunle, J. A. “An Analysis of the Sphere of Influence of Agro Commodities from Kaduna State, Nigeria”. International Journal of Science for Global Sustainability, vol. 2, no. 4, Dec. 2016, p. 14, https://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/225.