1. Manual of steel construction. Load & resistance factor design;AISC,1994
2. CEN/TC 250. Eurocode 3: Design of steel structures — Part 1–1: General rules and rules for buildings. European prestandard ENV 1993-1-1:1992, February 1992.
3. CEN/TC 250. Eurocode 3: Design of steel structures — Part 1–1: General rules and rules for buildings. European Standard EN 1993-1-1:2005, May 2005.
4. DIN 18800–1. Stahlbauten - Bemessung und Konstruktion (steel structures, design and construction). November 1990.
5. DIN 18800–2. Stahlbauten - Stabilitätsfälle, Knicken von Stäben und Stabwerken (steel structures, stability, buckling of bars and skeletal structures). Nov 1990.