APA (7e ed.) Bronvermelding

Não informado. (1917). NATIONAL SAFETY NEWS. National Safety Council.

Chicago (17e ed.) Bronvermelding

Não informado. NATIONAL SAFETY NEWS. Chicago, Ill: National Safety Council, 1917.

MLA (8e ed.) Bronvermelding

Não informado. NATIONAL SAFETY NEWS. National Safety Council, 1917.

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