APA (7e ed.) Bronvermelding

Não informado. (1957). Traffic safety. National Safety Council.

Chicago (17e ed.) Bronvermelding

Não informado. Traffic Safety. Chicago, Ill: National Safety Council, 1957.

MLA (8e ed.) Bronvermelding

Não informado. Traffic Safety. National Safety Council, 1957.

Let op: Deze citaties zijn niet altijd 100% accuraat.