Audu , I., and T.M. Hess. “Simulation of Potential Benefit of Water Conservation in the North East Arid Zone of Nigeria”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT 2 (October 1, 2002): 25-30. Accessed October 18, 2021. https://azojete.com.ng/index.php/azojete/article/view/302.