1. Building code requirements for reinforced concrete. (1989). American Concrete Inst. Detroit Mich.
2. Burden R. L. Faires J. D. and Reynolds A. C. (1981). Numerical analysis. 2nd Ed. Prindle Weber & Schmidt Boston Mass.
3. Nilson A. H. and Winter G. (1986). Design of concrete structures . 10th Ed. McGraw‐Hill Book Company New York N.Y