1. AASHTO (1998). Guide for commonly-recognized (CoRe) structural elements. Washington, DC: American Association of State Highway and Transportation Officials.
2. AASHTO (2011a). Guide manual for bridge element inspection. Washington, DC: American Association of State Highway and Transportation Officials.
3. AASHTO (2011b). The manual for bridge evaluation (2nd ed.). Washington, DC: AASHTO MBE-2, American Association of State Highway and Transportation Officials.
4. Ansari, F., Bao, Y., McNeil, S., Tennant, A., Wang, M. & Rapol, L.R. (2003). Evaluation of bridge inspection and assessment in Illinois. Final Report, ITRC Project IVD. H1Springfield, IL: Illinois Department of Transportation.
5. ASCE (2009). Report card for America's infrastructure. American Society of Civil Engineering. http://www.infrastructurereportcard.org/fact-sheet/bridges (Last accessed October 5, 2011).