Allsop, R. E. (1967). Costs and benefits arising if all motorcyclists wore safety helmets. Road Research Laboratory.
Chicago-Zitierstil (17. Ausg.)Allsop, R. E. Costs and Benefits Arising If All Motorcyclists Wore Safety Helmets. Crowthorne: Road Research Laboratory, 1967.
MLA-Zitierstil (9. Ausg.)Allsop, R. E. Costs and Benefits Arising If All Motorcyclists Wore Safety Helmets. Road Research Laboratory, 1967.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.