Sabey, B. E. (1980). Road safety and value for money. Transport and Road Research Laboratory, Accident Investigation Division.
Lua i Stíl Chicago (17ú heag.)Sabey, Barbara E. Road Safety and Value for Money. Crowthorne, Berk: Transport and Road Research Laboratory, Accident Investigation Division, 1980.
Lua MLA (9ú heag.)Sabey, Barbara E. Road Safety and Value for Money. Transport and Road Research Laboratory, Accident Investigation Division, 1980.
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