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Federal Highway Administration (FHWA) Office of Innovative Program Delivery. Public-Private Partnerships: Case Studies. Washington, D.C.: FHWA, 2010, http://www.fhwa.dot.gov/ipd/p3/case_studies/index.htm.
NW Financial Group LLC. Then There Were Two: Indiana Toll Road vs. Chicago Skyway. N.P.: NW Financial Group LLC, November 2006, http://www.corridorwatch.org/ttc/pdf/indiana_toll_road.pdf.
"U.S. & Canadian Transportation Projects Scorecard." Public Works Financing 249 (May 2010): 24-25, http://www.publicinfrastructure.ca.gov/GSLibrary/Downloads/download.ashx?fle=sites/1832/17450/442064/May%202010%20Issue%2C%20PUBLIC%20WORKS%20FINANCING.pdf.