APA
U.S. Department of Transportation. FHWA. Office of Environmental Policy, . (1981). Visual impact assessment for highway projects. Washington DC: U.S. Department of Transportation. FHWA. Office of Environmental Policy.
Chicago
U.S. Department of Transportation. FHWA. Office of Environmental Policy, . 1981. Visual impact assessment for highway projects. Washington DC: U.S. Department of Transportation. FHWA. Office of Environmental Policy.
Harvard
U.S. Department of Transportation. FHWA. Office of Environmental Policy, . (1981). Visual impact assessment for highway projects. Washington DC: U.S. Department of Transportation. FHWA. Office of Environmental Policy.
MLA
U.S. Department of Transportation. FHWA. Office of Environmental Policy, . Visual impact assessment for highway projects. Washington DC: U.S. Department of Transportation. FHWA. Office of Environmental Policy. 1981.