Mustapha, S. B, et al. “Assessment of Agricultural Extension Service Delivery on Dry Season Onion Production in Bama Local Government Area of Borno State, Nigeria”. International Academic Journal of Social Sciences, vol. 3, no. 2, Dec. 2016, pp. 141-7, https://iaiest.com/iaj/index.php/IAJSS/article/view/IAJSS1510035.