Omundi, L., S. Yadima, and B. Sanyaolu. “The Effect of Varied Mix Proportion and Water-Cement Ratio on the Compressive Strength of Medium Grade Concretepoduced from Bama Gravel”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 3, Oct. 2003, pp. 44-48, https://www.azojete.com.ng/index.php/azojete/article/view/312.