NCSL Fiscal Affairs Program. State Budget Update: July 2010 (Preliminary Report). Denver, Colo.: NCSL, 2010.
---. State Budget Update: November 2009. Denver, Colo.: NCSL, 2009.
NCSL Transportation Program. NCSL Transportation Funding Legislation Database. Denver, Colo.: NCSL, 2010, http://www.ncsl.org/default.aspx?tabid=13597.
Reed, James B. "Transportation Funding Outlook 2009." LegisBrief (National Conference of State Legislatures) 17, no. 10 (February 2009).
Sundeen, Matt, and James B. Reed. Surface Transportation Funding: Options for States. Denver, Colo.: NCSL, 2006, http://www.ncsl.org/documents/transportation/surfacetranfundrept.pdf.