O, O. A., and A. E. N. “Econometric Analysis of Food Crops’ Response to Climate Variability and Macroeconomic Policies’ Reforms in Nigeria (1978-2009)”. Asian Journal of Agriculture and Rural Development, vol. 2, no. 3, Sept. 2012, pp. 487-9, https://archive.aessweb.com/index.php/5005/article/view/594.