"Information Release 07-016"(PDF) (Press release). Oklahoma Department of Transportation. March 21, 2007. Archived from the original(PDF) on October 26, 2007. Retrieved August 12, 2007.
"Information Release 07-016"(PDF) (Press release). Oklahoma Department of Transportation. March 21, 2007. Archived from the original(PDF) on October 26, 2007. Retrieved August 12, 2007.