APA (7th ed.) Citation

United States. Federal Highway Administration. (2002). United States road symbol signs. Dept. of Transportation, Federal Highway Administration.

Chicago Style (17th ed.) Citation

United States. Federal Highway Administration. United States Road Symbol Signs. Washington: Dept. of Transportation, Federal Highway Administration, 2002.

MLA (9th ed.) Citation

United States. Federal Highway Administration. United States Road Symbol Signs. Dept. of Transportation, Federal Highway Administration, 2002.