Nelsen, Carrie (July 9, 2015). "For Immediate Release"(PDF) (Press release). Illinois Department of Transportation. Archived from the original(PDF) on September 6, 2015.
Nelsen, Carrie (July 9, 2015). "For Immediate Release"(PDF) (Press release). Illinois Department of Transportation. Archived from the original(PDF) on September 6, 2015.