APA

U.S. Department of Transportation. FHWA, . (1980). Manual on uniform traffic control devices for streets and highways. Part VI. Washington DC: U.S. Department of Transportation. FHWA.

Chicago

U.S. Department of Transportation. FHWA, . 1980. Manual on uniform traffic control devices for streets and highways. Part VI. Washington DC: U.S. Department of Transportation. FHWA.

Harvard

U.S. Department of Transportation. FHWA, . (1980). Manual on uniform traffic control devices for streets and highways. Part VI. Washington DC: U.S. Department of Transportation. FHWA.

MLA

U.S. Department of Transportation. FHWA, . Manual on uniform traffic control devices for streets and highways. Part VI. Washington DC: U.S. Department of Transportation. FHWA. 1980.