1. American Concrete Institute “Building Code Requirements for Reinforced Concrete ” ACI Standard 318‐83 1983.
2. Bach F. Nielson M. P. and Braestrup M. W. “Shear Tests on Reinforced Concrete T‐Beams Series V U X B and S ” Rapport NR.R120 Structural Research Laboratory Technical Univ. of Denmark 1980.
3. British Standards Institution “The Structural Use of Concrete Part 1: Design Materials and Workmanship ” CP110 Part 1 London England 1972.