APA
Washington State Highway Commission, . (1977). Manual for pavement condition rating surveys. Olympia, WA: Washington State Highway Commission.
Chicago
Washington State Highway Commission, . 1977. Manual for pavement condition rating surveys. Olympia, WA: Washington State Highway Commission.
Harvard
Washington State Highway Commission, . (1977). Manual for pavement condition rating surveys. Olympia, WA: Washington State Highway Commission.
MLA
Washington State Highway Commission, . Manual for pavement condition rating surveys. Olympia, WA: Washington State Highway Commission. 1977.