• FHWA PPP web page, http://www.fhwa.dot.gov/ppp/chicago_skyway.htm
• FHWA Case Studies of Transportation Public-Private Partnerships in the United States, http://www.fhwa.dot.gov/ppp/us_ppp_case_studies_final_report_7-7-07.pdf
• 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
• 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, "The Chicago Skyway Sale: An Analytical Review," http://www.nwfinancial.com/newsroom/newsroom.html