Sabey, B. E. (1980). Road safety and value for money. Transport and Road Research Laboratory, Accident Investigation Division.
Chicago-referens (17:e uppl.)Sabey, Barbara E. Road Safety and Value for Money. Crowthorne, Berk: Transport and Road Research Laboratory, Accident Investigation Division, 1980.
MLA-referens (9:e uppl.)Sabey, Barbara E. Road Safety and Value for Money. Transport and Road Research Laboratory, Accident Investigation Division, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.