Rufai , A. U., H. M. . Tahir, I. B. . Usman, and I. T. . Ayuba. “The Role of Commercial Banks on Agricultural Development in Nigeria: (1980-2015) – Hac - Consistent Covariance OLS Estimation Method”. International Journal of Intellectual Discourse, vol. 2, no. 2, Dec. 2019, https://www.ijidjournal.org/index.php/ijid/article/view/736.