American Concrete Institute; http://www.aci-int.org
American Society of Civil Engineers; http://www.asce.org/asce.cfm
ASTM; http://www.astm.org
Computers and Structures Inc. http://www.csiberkeley.com/
Saudi Council of Engineers ; www.saudieng.org
Saudi Building Code; www.sbcnc.gov.sa/arabic/index.asp
Structural Group; www.structural.net