1. American Association of State Highway Officials Standard Specification for Highway Bridges 12th ed. Washington D.C. 1977.
2. American Iron and Steel Institute Tentative Specification for Load and Resistance Factor Design Fabrication and Erection of Structural Steel for Building 5th draft May 1981.
3. American National Standards Institute National Electrical Safety Code Institute of Electrical and Electronic Engineers (IEEE) New York N.Y. 1977.
4. American Railway Engineers Association Specifications for Steel Railway Bridges Chicago 1971.
5. American Society of Civil Engineers “Guide for Design of Steel Transmission Towers ” ASCE Manuals and Reports on Engineering Practice No. 52 New York N.Y. 1971.