• FHWA PPP web page, http://www.fhwa.dot.gov/ppp/indiana_tollway.htm
• U.S. Government Accountability Office, Highway Public-Private Partnerships: More Rigorous Up-Front Analysis Could Better Secure Potential Benefits and Protect the Public Interest, Report No. GAO-08-44, http://www.gao.gov/new.items/d0844.pdf
• Reason Foundation, "Indiana Policy Review: Bottom Line on Indiana Toll Road Deal," Commentary by Geoffrey Segal, http://www.reason.org/commentaries/segal_20060710.shtml
• USC Keston Institute for Public Finance and Infrastructure Policy, "Protecting the Public Interest: The Role of Long-Term Concession Agreements for Providing Transportation Infrastructure," http://www.usc.edu/schools/sppd/keston/research/index.html
• NW Financial Group, "Indiana Toll Road vs. Chicago Skyway: An Analytical Review of Two Public-Private Partnerships," http://www.nwfinancial.com/newsroom/%20newsroom.html