APA (7e ed.) Bronvermelding

Não informado. (1915). Accident prevention magazine. Portland Cement Association.

Chicago (17e ed.) Bronvermelding

Não informado. Accident Prevention Magazine. Chicago, Ill: Portland Cement Association, 1915.

MLA (8e ed.) Bronvermelding

Não informado. Accident Prevention Magazine. Portland Cement Association, 1915.

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