APA

U.S. Department of Transportation, Federal Highway Administration & Natural and Human Environment Office. (2003). Keeping it simple. Washington DC: U.S. Department of Transportation.

Chicago

U.S. Department of Transportation, Federal Highway Administration and Natural and Human Environment Office. 2003. Keeping it simple. Washington DC: U.S. Department of Transportation.

Harvard

U.S. Department of Transportation, Federal Highway Administration and Natural and Human Environment Office. (2003). Keeping it simple. Washington DC: U.S. Department of Transportation.

MLA

U.S. Department of Transportation, Federal Highway Administration and Natural and Human Environment Office. Keeping it simple. Washington DC: U.S. Department of Transportation. 2003.