Delaware Department of Highways and Transportation (1971). Delaware Highways Official Map(PDF) (Map). Dover: Delaware Department of Highways and Transportation. Retrieved November 24, 2015.
Delaware Department of Transportation (2017). Official Travel & Transportation Map(PDF) (Map). Dover: Delaware Department of Transportation. Retrieved August 18, 2019.
Delaware State Highway Department (1920). Official Road Map(PDF) (Map). Dover: Delaware State Highway Department. Retrieved November 24, 2015.
Delaware State Highway Department (1924). Official Road Map(PDF) (Map). Dover: Delaware State Highway Department. Retrieved November 24, 2015.
Delaware State Highway Department; The National Survey Co. (1936). Official Road Map of the State of Delaware(PDF) (Map) (1936–1937 ed.). Dover: Delaware State Highway Department. Retrieved November 24, 2015.
Delaware State Highway Department (1952). Official Highway Map of Delaware(PDF) (Map) (1952–1953 ed.). Dover: Delaware State Highway Department. Retrieved November 24, 2015.