1. R. Young, Transportation Infrastructure: an Overview of Highway Systems and south carolina's Position and Status, Institute for Public Service and Policy Research, University of South Carolina.
2. National bridge inspection standards (nbis);FHWA;Fed. Regist.,2009
3. R. ASCE/SEI-AASHTO Ad-Hoc Group on Bridge Inspection, Rating, Replacement, White Paper on Bridge Inspection and Rating,2009