APA

Transportation Research Record nr 643, . (1977). Traffic records, law enforcement, and motorist-aid systems. Washington DC: Transportation Research Record nr 643.

Chicago

Transportation Research Record nr 643, . 1977. Traffic records, law enforcement, and motorist-aid systems. Washington DC: Transportation Research Record nr 643.

Harvard

Transportation Research Record nr 643, . (1977). Traffic records, law enforcement, and motorist-aid systems. Washington DC: Transportation Research Record nr 643.

MLA

Transportation Research Record nr 643, . Traffic records, law enforcement, and motorist-aid systems. Washington DC: Transportation Research Record nr 643. 1977.