Indiana Department of Transportation (July 23, 2004). "Greenfield District Area Reference Posts"(PDF). Indiana Department of Transportation. Archived from the original(PDF) on February 9, 2017. Retrieved January 19, 2010.
Indiana Department of Transportation (July 23, 2004). "Greenfield District Area Reference Posts"(PDF). Indiana Department of Transportation. Archived from the original(PDF) on February 9, 2017. Retrieved January 19, 2010.