Olajumoke, A.M., I.A. Oke, K.A. Olonade, and A.A. Laoye. 2012. “Effects of Non-Potable Water On the Strengths of Concrete”. Ife Journal of Technology 21 (2), 38-42. http://ijt.oauife.edu.ng/index.php/ijt/article/view/106.