وب سایت های استاندارد
AASHTO- American Association of state Highways and transportion officials
AFNOR – Association Fram caise de Normalisation
ANST- American National standard Institute
ASTM- American society for testing Materials
BST- British standards
CEN-European committee for standardization
DIN- Deat sches Institut fuer Normany e.v.
ISIRI Iran standar